The Tor Browser: dom/ipc/TabChild.cpp@7e26c7da4463 (annotated)

dom/ipc/TabChild.cpp@7e26c7da4463 (annotated)

dom/ipc/TabChild.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8; -*- */
 /* vim: set sw=2 sts=2 ts=8 et tw=80 : */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "base/basictypes.h"
 #include "TabChild.h"
 #include "Layers.h"
 #include "ContentChild.h"
 #include "IndexedDBChild.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/IntentionalCrash.h"
 #include "mozilla/docshell/OfflineCacheUpdateChild.h"
 #include "mozilla/ipc/DocumentRendererChild.h"
 #include "mozilla/ipc/FileDescriptorUtils.h"
 #include "mozilla/layers/ActiveElementManager.h"
 #include "mozilla/layers/APZCCallbackHelper.h"
 #include "mozilla/layers/AsyncPanZoomController.h"
 #include "mozilla/layers/CompositorChild.h"
 #include "mozilla/layers/ImageBridgeChild.h"
 #include "mozilla/layers/ShadowLayers.h"
 #include "mozilla/layout/RenderFrameChild.h"
 #include "mozilla/MouseEvents.h"
 #include "mozilla/Services.h"
 #include "mozilla/StaticPtr.h"
 #include "mozilla/TextEvents.h"
 #include "mozilla/TouchEvents.h"
 #include "mozilla/unused.h"
 #include "mozIApplication.h"
 #include "nsContentUtils.h"
 #include "nsCxPusher.h"
 #include "nsEmbedCID.h"
 #include <algorithm>
 #ifdef MOZ_CRASHREPORTER
 #include "nsExceptionHandler.h"
 #endif
 #include "nsFilePickerProxy.h"
 #include "mozilla/dom/Element.h"
 #include "nsIBaseWindow.h"
 #include "nsICachedFileDescriptorListener.h"
 #include "nsIDocumentInlines.h"
 #include "nsIDocShellTreeOwner.h"
 #include "nsIDOMEvent.h"
 #include "nsIDOMWindow.h"
 #include "nsIDOMWindowUtils.h"
 #include "nsIDocShell.h"
 #include "nsIURI.h"
 #include "nsIURIFixup.h"
 #include "nsCDefaultURIFixup.h"
 #include "nsIWebBrowser.h"
 #include "nsIWebBrowserFocus.h"
 #include "nsIWebBrowserSetup.h"
 #include "nsIWebProgress.h"
 #include "nsIXULRuntime.h"
 #include "nsInterfaceHashtable.h"
 #include "nsPIDOMWindow.h"
 #include "nsPIWindowRoot.h"
 #include "nsLayoutUtils.h"
 #include "nsPrintfCString.h"
 #include "nsThreadUtils.h"
 #include "nsWeakReference.h"
 #include "PermissionMessageUtils.h"
 #include "PCOMContentPermissionRequestChild.h"
 #include "PuppetWidget.h"
 #include "StructuredCloneUtils.h"
 #include "nsViewportInfo.h"
 #include "JavaScriptChild.h"
 #include "nsILoadContext.h"
 #include "ipc/nsGUIEventIPC.h"
 #include "mozilla/gfx/Matrix.h"
 #include "UnitTransforms.h"
 #include "ClientLayerManager.h"
 #include "nsColorPickerProxy.h"
 #ifdef DEBUG
 #include "PCOMContentPermissionRequestChild.h"
 #endif /* DEBUG */
 #define BROWSER_ELEMENT_CHILD_SCRIPT \
     NS_LITERAL_STRING("chrome://global/content/BrowserElementChild.js")
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::dom::ipc;
 using namespace mozilla::ipc;
 using namespace mozilla::layers;
 using namespace mozilla::layout;
 using namespace mozilla::docshell;
 using namespace mozilla::dom::indexedDB;
 using namespace mozilla::widget;
 using namespace mozilla::jsipc;
 NS_IMPL_ISUPPORTS(ContentListener, nsIDOMEventListener)
 static const CSSSize kDefaultViewportSize(980, 480);
 static const char BROWSER_ZOOM_TO_RECT[] = "browser-zoom-to-rect";
 static const char BEFORE_FIRST_PAINT[] = "before-first-paint";
 static bool sCpowsEnabled = false;
 static int32_t sActiveDurationMs = 10;
 static bool sActiveDurationMsSet = false;
 typedef nsDataHashtable<nsUint64HashKey, TabChild*> TabChildMap;
 static TabChildMap* sTabChildren;
 TabChildBase::TabChildBase()
   : mOldViewportWidth(0.0f)
   , mContentDocumentIsDisplayed(false)
   , mTabChildGlobal(nullptr)
   , mInnerSize(0, 0)
 {
 }
 NS_IMPL_CYCLE_COLLECTING_ADDREF(TabChildBase)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(TabChildBase)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TabChildBase)
   NS_INTERFACE_MAP_ENTRY(nsISupports)
 NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTION(TabChildBase, mTabChildGlobal, mGlobal)
 void
 TabChildBase::InitializeRootMetrics()
 {
   // Calculate a really simple resolution that we probably won't
   // be keeping, as well as putting the scroll offset back to
   // the top-left of the page.
   mLastRootMetrics.mViewport = CSSRect(CSSPoint(), kDefaultViewportSize);
   mLastRootMetrics.mCompositionBounds = ParentLayerIntRect(
       ParentLayerIntPoint(),
       ViewAs<ParentLayerPixel>(mInnerSize, PixelCastJustification::ScreenToParentLayerForRoot));
   mLastRootMetrics.SetZoom(mLastRootMetrics.CalculateIntrinsicScale());
   mLastRootMetrics.mDevPixelsPerCSSPixel = WebWidget()->GetDefaultScale();
   // We use ScreenToLayerScale(1) below in order to turn the
   // async zoom amount into the gecko zoom amount.
   mLastRootMetrics.mCumulativeResolution =
     mLastRootMetrics.GetZoom() / mLastRootMetrics.mDevPixelsPerCSSPixel * ScreenToLayerScale(1);
   // This is the root layer, so the cumulative resolution is the same
   // as the resolution.
   mLastRootMetrics.mResolution = mLastRootMetrics.mCumulativeResolution / LayoutDeviceToParentLayerScale(1);
   mLastRootMetrics.SetScrollOffset(CSSPoint(0, 0));
 }
 bool
 TabChildBase::HasValidInnerSize()
 {
   return (mInnerSize.width != 0) && (mInnerSize.height != 0);
 }
 void
 TabChildBase::SetCSSViewport(const CSSSize& aSize)
 {
   mOldViewportWidth = aSize.width;
   if (mContentDocumentIsDisplayed) {
     nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
     utils->SetCSSViewport(aSize.width, aSize.height);
   }
 }
 CSSSize
 TabChildBase::GetPageSize(nsCOMPtr<nsIDocument> aDocument, const CSSSize& aViewport)
 {
   nsCOMPtr<Element> htmlDOMElement = aDocument->GetHtmlElement();
   HTMLBodyElement* bodyDOMElement = aDocument->GetBodyElement();
   if (!htmlDOMElement && !bodyDOMElement) {
     // For non-HTML content (e.g. SVG), just assume page size == viewport size.
     return aViewport;
   }
   int32_t htmlWidth = 0, htmlHeight = 0;
   if (htmlDOMElement) {
     htmlWidth = htmlDOMElement->ScrollWidth();
     htmlHeight = htmlDOMElement->ScrollHeight();
   }
   int32_t bodyWidth = 0, bodyHeight = 0;
   if (bodyDOMElement) {
     bodyWidth = bodyDOMElement->ScrollWidth();
     bodyHeight = bodyDOMElement->ScrollHeight();
   }
   return CSSSize(std::max(htmlWidth, bodyWidth),
                  std::max(htmlHeight, bodyHeight));
 }
 bool
 TabChildBase::HandlePossibleViewportChange()
 {
   if (!IsAsyncPanZoomEnabled()) {
     return false;
   }
   nsCOMPtr<nsIDocument> document(GetDocument());
   nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
   nsViewportInfo viewportInfo = nsContentUtils::GetViewportInfo(document, mInnerSize);
   uint32_t presShellId;
   mozilla::layers::FrameMetrics::ViewID viewId;
   bool scrollIdentifiersValid = APZCCallbackHelper::GetScrollIdentifiers(
         document->GetDocumentElement(), &presShellId, &viewId);
   if (scrollIdentifiersValid) {
     ZoomConstraints constraints(
       viewportInfo.IsZoomAllowed(),
       viewportInfo.IsDoubleTapZoomAllowed(),
       viewportInfo.GetMinZoom(),
       viewportInfo.GetMaxZoom());
     DoUpdateZoomConstraints(presShellId,
                             viewId,
                             /* isRoot = */ true,
                             constraints);
   }
   float screenW = mInnerSize.width;
   float screenH = mInnerSize.height;
   CSSSize viewport(viewportInfo.GetSize());
   // We're not being displayed in any way; don't bother doing anything because
   // that will just confuse future adjustments.
   if (!screenW || !screenH) {
     return false;
   }
   float oldBrowserWidth = mOldViewportWidth;
   mLastRootMetrics.mViewport.SizeTo(viewport);
   if (!oldBrowserWidth) {
     oldBrowserWidth = kDefaultViewportSize.width;
   }
   SetCSSViewport(viewport);
   // If this page has not been painted yet, then this must be getting run
   // because a meta-viewport element was added (via the DOMMetaAdded handler).
   // in this case, we should not do anything that forces a reflow (see bug
   // 759678) such as requesting the page size or sending a viewport update. this
   // code will get run again in the before-first-paint handler and that point we
   // will run though all of it. the reason we even bother executing up to this
   // point on the DOMMetaAdded handler is so that scripts that use
   // window.innerWidth before they are painted have a correct value (bug
   // 771575).
   if (!mContentDocumentIsDisplayed) {
     return false;
   }
   float oldScreenWidth = mLastRootMetrics.mCompositionBounds.width;
   if (!oldScreenWidth) {
     oldScreenWidth = mInnerSize.width;
   }
   FrameMetrics metrics(mLastRootMetrics);
   metrics.mViewport = CSSRect(CSSPoint(), viewport);
   metrics.mCompositionBounds = ParentLayerIntRect(
       ParentLayerIntPoint(),
       ViewAs<ParentLayerPixel>(mInnerSize, PixelCastJustification::ScreenToParentLayerForRoot));
   metrics.SetRootCompositionSize(
       ScreenSize(mInnerSize) * ScreenToLayoutDeviceScale(1.0f) / metrics.mDevPixelsPerCSSPixel);
   // This change to the zoom accounts for all types of changes I can conceive:
   // 1. screen size changes, CSS viewport does not (pages with no meta viewport
   //    or a fixed size viewport)
   // 2. screen size changes, CSS viewport also does (pages with a device-width
   //    viewport)
   // 3. screen size remains constant, but CSS viewport changes (meta viewport
   //    tag is added or removed)
   // 4. neither screen size nor CSS viewport changes
   //
   // In all of these cases, we maintain how much actual content is visible
   // within the screen width. Note that "actual content" may be different with
   // respect to CSS pixels because of the CSS viewport size changing.
   float oldIntrinsicScale = oldScreenWidth / oldBrowserWidth;
   metrics.ZoomBy(metrics.CalculateIntrinsicScale().scale / oldIntrinsicScale);
   // Changing the zoom when we're not doing a first paint will get ignored
   // by AsyncPanZoomController and causes a blurry flash.
   bool isFirstPaint;
   nsresult rv = utils->GetIsFirstPaint(&isFirstPaint);
   if (NS_FAILED(rv) || isFirstPaint) {
     // FIXME/bug 799585(?): GetViewportInfo() returns a defaultZoom of
     // 0.0 to mean "did not calculate a zoom".  In that case, we default
     // it to the intrinsic scale.
     if (viewportInfo.GetDefaultZoom().scale < 0.01f) {
       viewportInfo.SetDefaultZoom(metrics.CalculateIntrinsicScale());
     }
     CSSToScreenScale defaultZoom = viewportInfo.GetDefaultZoom();
     MOZ_ASSERT(viewportInfo.GetMinZoom() <= defaultZoom &&
                defaultZoom <= viewportInfo.GetMaxZoom());
     metrics.SetZoom(defaultZoom);
     metrics.SetScrollId(viewId);
   }
   metrics.mCumulativeResolution = metrics.GetZoom() / metrics.mDevPixelsPerCSSPixel * ScreenToLayerScale(1);
   // This is the root layer, so the cumulative resolution is the same
   // as the resolution.
   metrics.mResolution = metrics.mCumulativeResolution / LayoutDeviceToParentLayerScale(1);
   utils->SetResolution(metrics.mResolution.scale, metrics.mResolution.scale);
   CSSSize scrollPort = metrics.CalculateCompositedSizeInCssPixels();
   utils->SetScrollPositionClampingScrollPortSize(scrollPort.width, scrollPort.height);
   // The call to GetPageSize forces a resize event to content, so we need to
   // make sure that we have the right CSS viewport and
   // scrollPositionClampingScrollPortSize set up before that happens.
   CSSSize pageSize = GetPageSize(document, viewport);
   if (!pageSize.width) {
     // Return early rather than divide by 0.
     return false;
   }
   metrics.mScrollableRect = CSSRect(CSSPoint(), pageSize);
   // Calculate a display port _after_ having a scrollable rect because the
   // display port is clamped to the scrollable rect.
   metrics.SetDisplayPortMargins(AsyncPanZoomController::CalculatePendingDisplayPort(
     // The page must have been refreshed in some way such as a new document or
     // new CSS viewport, so we know that there's no velocity, acceleration, and
     // we have no idea how long painting will take.
     metrics, ScreenPoint(0.0f, 0.0f), 0.0));
   metrics.SetUseDisplayPortMargins();
   // Force a repaint with these metrics. This, among other things, sets the
   // displayport, so we start with async painting.
   mLastRootMetrics = ProcessUpdateFrame(metrics);
   if (viewportInfo.IsZoomAllowed() && scrollIdentifiersValid) {
     // If the CSS viewport is narrower than the screen (i.e. width <= device-width)
     // then we disable double-tap-to-zoom behaviour.
     bool allowDoubleTapZoom = (viewport.width > screenW / metrics.mDevPixelsPerCSSPixel.scale);
     if (allowDoubleTapZoom != viewportInfo.IsDoubleTapZoomAllowed()) {
       viewportInfo.SetAllowDoubleTapZoom(allowDoubleTapZoom);
       ZoomConstraints constraints(
         viewportInfo.IsZoomAllowed(),
         viewportInfo.IsDoubleTapZoomAllowed(),
         viewportInfo.GetMinZoom(),
         viewportInfo.GetMaxZoom());
       DoUpdateZoomConstraints(presShellId,
                               viewId,
                               /* isRoot = */ true,
                               constraints);
     }
   }
   return true;
 }
 already_AddRefed<nsIDOMWindowUtils>
 TabChildBase::GetDOMWindowUtils()
 {
   nsCOMPtr<nsPIDOMWindow> window = do_GetInterface(WebNavigation());
   nsCOMPtr<nsIDOMWindowUtils> utils = do_GetInterface(window);
   return utils.forget();
 }
 already_AddRefed<nsIDocument>
 TabChildBase::GetDocument()
 {
   nsCOMPtr<nsIDOMDocument> domDoc;
   WebNavigation()->GetDocument(getter_AddRefs(domDoc));
   nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
   return doc.forget();
 }
 void
 TabChildBase::DispatchMessageManagerMessage(const nsAString& aMessageName,
                                             const nsAString& aJSONData)
 {
     AutoSafeJSContext cx;
     JS::Rooted<JS::Value> json(cx, JSVAL_NULL);
     StructuredCloneData cloneData;
     JSAutoStructuredCloneBuffer buffer;
     if (JS_ParseJSON(cx,
                       static_cast<const jschar*>(aJSONData.BeginReading()),
                       aJSONData.Length(),
                       &json)) {
         WriteStructuredClone(cx, json, buffer, cloneData.mClosure);
         cloneData.mData = buffer.data();
         cloneData.mDataLength = buffer.nbytes();
     }
     nsCOMPtr<nsIXPConnectJSObjectHolder> kungFuDeathGrip(GetGlobal());
     // Let the BrowserElementScrolling helper (if it exists) for this
     // content manipulate the frame state.
     nsRefPtr<nsFrameMessageManager> mm =
       static_cast<nsFrameMessageManager*>(mTabChildGlobal->mMessageManager.get());
     mm->ReceiveMessage(static_cast<EventTarget*>(mTabChildGlobal),
                        aMessageName, false, &cloneData, nullptr, nullptr, nullptr);
 }
 bool
 TabChildBase::UpdateFrameHandler(const FrameMetrics& aFrameMetrics)
 {
   MOZ_ASSERT(aFrameMetrics.GetScrollId() != FrameMetrics::NULL_SCROLL_ID);
   if (aFrameMetrics.mIsRoot) {
     nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
     if (APZCCallbackHelper::HasValidPresShellId(utils, aFrameMetrics)) {
       mLastRootMetrics = ProcessUpdateFrame(aFrameMetrics);
       APZCCallbackHelper::UpdateCallbackTransform(aFrameMetrics, mLastRootMetrics);
       return true;
     }
   } else {
     // aFrameMetrics.mIsRoot is false, so we are trying to update a subframe.
     // This requires special handling.
     nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(
                                       aFrameMetrics.GetScrollId());
     if (content) {
       FrameMetrics newSubFrameMetrics(aFrameMetrics);
       APZCCallbackHelper::UpdateSubFrame(content, newSubFrameMetrics);
       APZCCallbackHelper::UpdateCallbackTransform(aFrameMetrics, newSubFrameMetrics);
       return true;
     }
   }
   // We've recieved a message that is out of date and we want to ignore.
   // However we can't reply without painting so we reply by painting the
   // exact same thing as we did before.
   mLastRootMetrics = ProcessUpdateFrame(mLastRootMetrics);
   return true;
 }
 FrameMetrics
 TabChildBase::ProcessUpdateFrame(const FrameMetrics& aFrameMetrics)
 {
     if (!mGlobal || !mTabChildGlobal) {
         return aFrameMetrics;
     }
     nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
     FrameMetrics newMetrics = aFrameMetrics;
     APZCCallbackHelper::UpdateRootFrame(utils, newMetrics);
     CSSSize cssCompositedSize = newMetrics.CalculateCompositedSizeInCssPixels();
     // The BrowserElementScrolling helper must know about these updated metrics
     // for other functions it performs, such as double tap handling.
     // Note, %f must not be used because it is locale specific!
     nsString data;
     data.AppendPrintf("{ \"x\" : %d", NS_lround(newMetrics.GetScrollOffset().x));
     data.AppendPrintf(", \"y\" : %d", NS_lround(newMetrics.GetScrollOffset().y));
     data.AppendLiteral(", \"viewport\" : ");
         data.AppendLiteral("{ \"width\" : ");
         data.AppendFloat(newMetrics.mViewport.width);
         data.AppendLiteral(", \"height\" : ");
         data.AppendFloat(newMetrics.mViewport.height);
         data.AppendLiteral(" }");
     data.AppendLiteral(", \"cssPageRect\" : ");
         data.AppendLiteral("{ \"x\" : ");
         data.AppendFloat(newMetrics.mScrollableRect.x);
         data.AppendLiteral(", \"y\" : ");
         data.AppendFloat(newMetrics.mScrollableRect.y);
         data.AppendLiteral(", \"width\" : ");
         data.AppendFloat(newMetrics.mScrollableRect.width);
         data.AppendLiteral(", \"height\" : ");
         data.AppendFloat(newMetrics.mScrollableRect.height);
         data.AppendLiteral(" }");
         data.AppendPrintf(", \"resolution\" : "); // TODO: check if it's actually used?
         data.AppendPrintf("{ \"width\" : ");
         data.AppendFloat(newMetrics.CalculateIntrinsicScale().scale);
         data.AppendPrintf(" }");
     data.AppendLiteral(", \"cssCompositedRect\" : ");
         data.AppendLiteral("{ \"width\" : ");
         data.AppendFloat(cssCompositedSize.width);
         data.AppendLiteral(", \"height\" : ");
         data.AppendFloat(cssCompositedSize.height);
         data.AppendLiteral(" }");
     data.AppendLiteral(" }");
     DispatchMessageManagerMessage(NS_LITERAL_STRING("Viewport:Change"), data);
     return newMetrics;
 }
 nsEventStatus
 TabChildBase::DispatchSynthesizedMouseEvent(uint32_t aMsg, uint64_t aTime,
                                             const LayoutDevicePoint& aRefPoint,
                                             nsIWidget* aWidget)
 {
   MOZ_ASSERT(aMsg == NS_MOUSE_MOVE || aMsg == NS_MOUSE_BUTTON_DOWN ||
              aMsg == NS_MOUSE_BUTTON_UP);
   WidgetMouseEvent event(true, aMsg, nullptr,
                          WidgetMouseEvent::eReal, WidgetMouseEvent::eNormal);
   event.refPoint = LayoutDeviceIntPoint(aRefPoint.x, aRefPoint.y);
   event.time = aTime;
   event.button = WidgetMouseEvent::eLeftButton;
   event.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
   if (aMsg != NS_MOUSE_MOVE) {
     event.clickCount = 1;
   }
   event.widget = aWidget;
   return DispatchWidgetEvent(event);
 }
 nsEventStatus
 TabChildBase::DispatchWidgetEvent(WidgetGUIEvent& event)
 {
   if (!event.widget)
     return nsEventStatus_eConsumeNoDefault;
   nsEventStatus status;
   NS_ENSURE_SUCCESS(event.widget->DispatchEvent(&event, status),
                     nsEventStatus_eConsumeNoDefault);
   return status;
 }
 bool
 TabChildBase::IsAsyncPanZoomEnabled()
 {
     return mScrolling == ASYNC_PAN_ZOOM;
 }
 NS_IMETHODIMP
 ContentListener::HandleEvent(nsIDOMEvent* aEvent)
 {
   RemoteDOMEvent remoteEvent;
   remoteEvent.mEvent = do_QueryInterface(aEvent);
   NS_ENSURE_STATE(remoteEvent.mEvent);
   mTabChild->SendEvent(remoteEvent);
   return NS_OK;
 }
 class TabChild::CachedFileDescriptorInfo
 {
     struct PathOnlyComparatorHelper
     {
         bool Equals(const nsAutoPtr<CachedFileDescriptorInfo>& a,
                     const CachedFileDescriptorInfo& b) const
         {
             return a->mPath == b.mPath;
         }
     };
     struct PathAndCallbackComparatorHelper
     {
         bool Equals(const nsAutoPtr<CachedFileDescriptorInfo>& a,
                     const CachedFileDescriptorInfo& b) const
         {
             return a->mPath == b.mPath &&
                    a->mCallback == b.mCallback;
         }
     };
 public:
     nsString mPath;
     FileDescriptor mFileDescriptor;
     nsCOMPtr<nsICachedFileDescriptorListener> mCallback;
     bool mCanceled;
     CachedFileDescriptorInfo(const nsAString& aPath)
       : mPath(aPath), mCanceled(false)
     { }
     CachedFileDescriptorInfo(const nsAString& aPath,
                              const FileDescriptor& aFileDescriptor)
       : mPath(aPath), mFileDescriptor(aFileDescriptor), mCanceled(false)
     { }
     CachedFileDescriptorInfo(const nsAString& aPath,
                              nsICachedFileDescriptorListener* aCallback)
       : mPath(aPath), mCallback(aCallback), mCanceled(false)
     { }
     PathOnlyComparatorHelper PathOnlyComparator() const
     {
         return PathOnlyComparatorHelper();
     }
     PathAndCallbackComparatorHelper PathAndCallbackComparator() const
     {
         return PathAndCallbackComparatorHelper();
     }
     void FireCallback() const
     {
         mCallback->OnCachedFileDescriptor(mPath, mFileDescriptor);
     }
 };
 class TabChild::CachedFileDescriptorCallbackRunnable : public nsRunnable
 {
     typedef TabChild::CachedFileDescriptorInfo CachedFileDescriptorInfo;
     nsAutoPtr<CachedFileDescriptorInfo> mInfo;
 public:
     CachedFileDescriptorCallbackRunnable(CachedFileDescriptorInfo* aInfo)
       : mInfo(aInfo)
     {
         MOZ_ASSERT(NS_IsMainThread());
         MOZ_ASSERT(aInfo);
         MOZ_ASSERT(!aInfo->mPath.IsEmpty());
         MOZ_ASSERT(aInfo->mCallback);
     }
     void Dispatch()
     {
         MOZ_ASSERT(NS_IsMainThread());
         nsresult rv = NS_DispatchToCurrentThread(this);
         NS_ENSURE_SUCCESS_VOID(rv);
     }
 private:
     NS_IMETHOD Run()
     {
         MOZ_ASSERT(NS_IsMainThread());
         MOZ_ASSERT(mInfo);
         mInfo->FireCallback();
         return NS_OK;
     }
 };
 StaticRefPtr<TabChild> sPreallocatedTab;
 /*static*/ void
 TabChild::PreloadSlowThings()
 {
     MOZ_ASSERT(!sPreallocatedTab);
     nsRefPtr<TabChild> tab(new TabChild(ContentChild::GetSingleton(),
                                         TabContext(), /* chromeFlags */ 0));
     if (!NS_SUCCEEDED(tab->Init()) ||
         !tab->InitTabChildGlobal(DONT_LOAD_SCRIPTS)) {
         return;
     }
     // Just load and compile these scripts, but don't run them.
     tab->TryCacheLoadAndCompileScript(BROWSER_ELEMENT_CHILD_SCRIPT, true);
     // Load, compile, and run these scripts.
     tab->RecvLoadRemoteScript(
         NS_LITERAL_STRING("chrome://global/content/preload.js"),
         true);
     nsCOMPtr<nsIDocShell> docShell = do_GetInterface(tab->WebNavigation());
     if (nsIPresShell* presShell = docShell->GetPresShell()) {
         // Initialize and do an initial reflow of the about:blank
         // PresShell to let it preload some things for us.
         presShell->Initialize(0, 0);
         nsIDocument* doc = presShell->GetDocument();
         doc->FlushPendingNotifications(Flush_Layout);
         // ... but after it's done, make sure it doesn't do any more
         // work.
         presShell->MakeZombie();
     }
     sPreallocatedTab = tab;
     ClearOnShutdown(&sPreallocatedTab);
 }
 /*static*/ already_AddRefed<TabChild>
 TabChild::Create(ContentChild* aManager, const TabContext &aContext, uint32_t aChromeFlags)
 {
     if (sPreallocatedTab &&
         sPreallocatedTab->mChromeFlags == aChromeFlags &&
         aContext.IsBrowserOrApp()) {
         nsRefPtr<TabChild> child = sPreallocatedTab.get();
         sPreallocatedTab = nullptr;
         MOZ_ASSERT(!child->mTriedBrowserInit);
         child->SetTabContext(aContext);
         child->NotifyTabContextUpdated();
         return child.forget();
     }
     nsRefPtr<TabChild> iframe = new TabChild(aManager,
                                              aContext, aChromeFlags);
     return NS_SUCCEEDED(iframe->Init()) ? iframe.forget() : nullptr;
 }
 TabChild::TabChild(ContentChild* aManager, const TabContext& aContext, uint32_t aChromeFlags)
   : TabContext(aContext)
   , mRemoteFrame(nullptr)
   , mManager(aManager)
   , mChromeFlags(aChromeFlags)
   , mLayersId(0)
   , mOuterRect(0, 0, 0, 0)
   , mActivePointerId(-1)
   , mTapHoldTimer(nullptr)
   , mAppPackageFileDescriptorRecved(false)
   , mLastBackgroundColor(NS_RGB(255, 255, 255))
   , mDidFakeShow(false)
   , mNotified(false)
   , mTriedBrowserInit(false)
   , mOrientation(eScreenOrientation_PortraitPrimary)
   , mUpdateHitRegion(false)
   , mContextMenuHandled(false)
   , mWaitingTouchListeners(false)
   , mIgnoreKeyPressEvent(false)
   , mActiveElementManager(new ActiveElementManager())
 {
   if (!sActiveDurationMsSet) {
     Preferences::AddIntVarCache(&sActiveDurationMs,
                                 "ui.touch_activation.duration_ms",
                                 sActiveDurationMs);
     sActiveDurationMsSet = true;
   }
 }
 NS_IMETHODIMP
 TabChild::HandleEvent(nsIDOMEvent* aEvent)
 {
   nsAutoString eventType;
   aEvent->GetType(eventType);
   if (eventType.EqualsLiteral("DOMMetaAdded")) {
     // This meta data may or may not have been a meta viewport tag. If it was,
     // we should handle it immediately.
     HandlePossibleViewportChange();
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::Observe(nsISupports *aSubject,
                   const char *aTopic,
                   const char16_t *aData)
 {
   if (!strcmp(aTopic, BROWSER_ZOOM_TO_RECT)) {
     nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aSubject));
     nsCOMPtr<nsITabChild> tabChild(TabChild::GetFrom(docShell));
     if (tabChild == this) {
       nsCOMPtr<nsIDocument> doc(GetDocument());
       uint32_t presShellId;
       ViewID viewId;
       if (APZCCallbackHelper::GetScrollIdentifiers(doc->GetDocumentElement(),
                                                     &presShellId, &viewId)) {
         CSSRect rect;
         sscanf(NS_ConvertUTF16toUTF8(aData).get(),
                "{\"x\":%f,\"y\":%f,\"w\":%f,\"h\":%f}",
                &rect.x, &rect.y, &rect.width, &rect.height);
         SendZoomToRect(presShellId, viewId, rect);
       }
     }
   } else if (!strcmp(aTopic, BEFORE_FIRST_PAINT)) {
     if (IsAsyncPanZoomEnabled()) {
       nsCOMPtr<nsIDocument> subject(do_QueryInterface(aSubject));
       nsCOMPtr<nsIDocument> doc(GetDocument());
       if (SameCOMIdentity(subject, doc)) {
         nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
         utils->SetIsFirstPaint(true);
         mContentDocumentIsDisplayed = true;
         // Reset CSS viewport and zoom to default on new page, then
         // calculate them properly using the actual metadata from the
         // page.
         SetCSSViewport(kDefaultViewportSize);
         // In some cases before-first-paint gets called before
         // RecvUpdateDimensions is called and therefore before we have an
         // mInnerSize value set. In such cases defer initializing the viewport
         // until we we get an inner size.
         if (HasValidInnerSize()) {
           InitializeRootMetrics();
           utils->SetResolution(mLastRootMetrics.mResolution.scale,
                                mLastRootMetrics.mResolution.scale);
           HandlePossibleViewportChange();
         }
       }
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnStateChange(nsIWebProgress* aWebProgress,
                         nsIRequest* aRequest,
                         uint32_t aStateFlags,
                         nsresult aStatus)
 {
   NS_NOTREACHED("not implemented in TabChild");
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnProgressChange(nsIWebProgress* aWebProgress,
                            nsIRequest* aRequest,
                            int32_t aCurSelfProgress,
                            int32_t aMaxSelfProgress,
                            int32_t aCurTotalProgress,
                            int32_t aMaxTotalProgress)
 {
   NS_NOTREACHED("not implemented in TabChild");
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnLocationChange(nsIWebProgress* aWebProgress,
                            nsIRequest* aRequest,
                            nsIURI *aLocation,
                            uint32_t aFlags)
 {
   if (!IsAsyncPanZoomEnabled()) {
     return NS_OK;
   }
   nsCOMPtr<nsIDOMWindow> window;
   aWebProgress->GetDOMWindow(getter_AddRefs(window));
   if (!window) {
     return NS_OK;
   }
   nsCOMPtr<nsIDOMDocument> progressDoc;
   window->GetDocument(getter_AddRefs(progressDoc));
   if (!progressDoc) {
     return NS_OK;
   }
   nsCOMPtr<nsIDOMDocument> domDoc;
   WebNavigation()->GetDocument(getter_AddRefs(domDoc));
   if (!domDoc || !SameCOMIdentity(domDoc, progressDoc)) {
     return NS_OK;
   }
   nsCOMPtr<nsIURIFixup> urifixup(do_GetService(NS_URIFIXUP_CONTRACTID));
   if (!urifixup) {
     return NS_OK;
   }
   nsCOMPtr<nsIURI> exposableURI;
   urifixup->CreateExposableURI(aLocation, getter_AddRefs(exposableURI));
   if (!exposableURI) {
     return NS_OK;
   }
   if (!(aFlags & nsIWebProgressListener::LOCATION_CHANGE_SAME_DOCUMENT)) {
     mContentDocumentIsDisplayed = false;
   } else if (mLastURI != nullptr) {
     bool exposableEqualsLast, exposableEqualsNew;
     exposableURI->Equals(mLastURI.get(), &exposableEqualsLast);
     exposableURI->Equals(aLocation, &exposableEqualsNew);
     if (exposableEqualsLast && !exposableEqualsNew) {
       mContentDocumentIsDisplayed = false;
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnStatusChange(nsIWebProgress* aWebProgress,
                          nsIRequest* aRequest,
                          nsresult aStatus,
                          const char16_t* aMessage)
 {
   NS_NOTREACHED("not implemented in TabChild");
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnSecurityChange(nsIWebProgress* aWebProgress,
                            nsIRequest* aRequest,
                            uint32_t aState)
 {
   NS_NOTREACHED("not implemented in TabChild");
   return NS_OK;
 }
 bool
 TabChild::DoUpdateZoomConstraints(const uint32_t& aPresShellId,
                                   const ViewID& aViewId,
                                   const bool& aIsRoot,
                                   const ZoomConstraints& aConstraints)
 {
   return SendUpdateZoomConstraints(aPresShellId,
                                    aViewId,
                                    aIsRoot,
                                    aConstraints);
 }
 nsresult
 TabChild::Init()
 {
   nsCOMPtr<nsIWebBrowser> webBrowser = do_CreateInstance(NS_WEBBROWSER_CONTRACTID);
   if (!webBrowser) {
     NS_ERROR("Couldn't create a nsWebBrowser?");
     return NS_ERROR_FAILURE;
   }
   webBrowser->SetContainerWindow(this);
   mWebNav = do_QueryInterface(webBrowser);
   NS_ASSERTION(mWebNav, "nsWebBrowser doesn't implement nsIWebNavigation?");
   nsCOMPtr<nsIDocShellTreeItem> docShellItem(do_QueryInterface(WebNavigation()));
   docShellItem->SetItemType(nsIDocShellTreeItem::typeContentWrapper);
   nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(WebNavigation());
   if (!baseWindow) {
     NS_ERROR("mWebNav doesn't QI to nsIBaseWindow");
     return NS_ERROR_FAILURE;
   }
   mWidget = nsIWidget::CreatePuppetWidget(this);
   if (!mWidget) {
     NS_ERROR("couldn't create fake widget");
     return NS_ERROR_FAILURE;
   }
   mWidget->Create(
     nullptr, 0,              // no parents
     nsIntRect(nsIntPoint(0, 0), nsIntSize(0, 0)),
     nullptr,                 // HandleWidgetEvent
     nullptr                  // nsDeviceContext
   );
   baseWindow->InitWindow(0, mWidget, 0, 0, 0, 0);
   baseWindow->Create();
   NotifyTabContextUpdated();
   // IPC uses a WebBrowser object for which DNS prefetching is turned off
   // by default. But here we really want it, so enable it explicitly
   nsCOMPtr<nsIWebBrowserSetup> webBrowserSetup =
     do_QueryInterface(baseWindow);
   if (webBrowserSetup) {
     webBrowserSetup->SetProperty(nsIWebBrowserSetup::SETUP_ALLOW_DNS_PREFETCH,
                                  true);
   } else {
     NS_WARNING("baseWindow doesn't QI to nsIWebBrowserSetup, skipping "
                "DNS prefetching enable step.");
   }
   nsCOMPtr<nsIDocShell> docShell = do_GetInterface(WebNavigation());
   MOZ_ASSERT(docShell);
   docShell->SetAffectPrivateSessionLifetime(
       mChromeFlags & nsIWebBrowserChrome::CHROME_PRIVATE_LIFETIME);
   nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(WebNavigation());
   MOZ_ASSERT(loadContext);
   loadContext->SetPrivateBrowsing(
       mChromeFlags & nsIWebBrowserChrome::CHROME_PRIVATE_WINDOW);
   loadContext->SetRemoteTabs(
       mChromeFlags & nsIWebBrowserChrome::CHROME_REMOTE_WINDOW);
   nsCOMPtr<nsIWebProgress> webProgress = do_GetInterface(docShell);
   NS_ENSURE_TRUE(webProgress, NS_ERROR_FAILURE);
   webProgress->AddProgressListener(this, nsIWebProgress::NOTIFY_LOCATION);
   // Few lines before, baseWindow->Create() will end up creating a new
   // window root in nsGlobalWindow::SetDocShell.
   // Then this chrome event handler, will be inherited to inner windows.
   // We want to also set it to the docshell so that inner windows
   // and any code that has access to the docshell
   // can all listen to the same chrome event handler.
   // XXX: ideally, we would set a chrome event handler earlier,
   // and all windows, even the root one, will use the docshell one.
   nsCOMPtr<nsPIDOMWindow> window = do_GetInterface(WebNavigation());
   NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
   nsCOMPtr<EventTarget> chromeHandler =
     do_QueryInterface(window->GetChromeEventHandler());
   docShell->SetChromeEventHandler(chromeHandler);
   return NS_OK;
 }
 void
 TabChild::NotifyTabContextUpdated()
 {
     nsCOMPtr<nsIDocShell> docShell = do_GetInterface(WebNavigation());
     MOZ_ASSERT(docShell);
     if (docShell) {
         // nsDocShell will do the right thing if we pass NO_APP_ID or
         // UNKNOWN_APP_ID for aOwnOrContainingAppId.
         if (IsBrowserElement()) {
           docShell->SetIsBrowserInsideApp(BrowserOwnerAppId());
         } else {
           docShell->SetIsApp(OwnAppId());
         }
     }
 }
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TabChild)
   NS_INTERFACE_MAP_ENTRY(nsIWebBrowserChrome)
   NS_INTERFACE_MAP_ENTRY(nsIWebBrowserChrome2)
   NS_INTERFACE_MAP_ENTRY(nsIEmbeddingSiteWindow)
   NS_INTERFACE_MAP_ENTRY(nsIWebBrowserChromeFocus)
   NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
   NS_INTERFACE_MAP_ENTRY(nsIWindowProvider)
   NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
   NS_INTERFACE_MAP_ENTRY(nsIWebProgressListener)
   NS_INTERFACE_MAP_ENTRY(nsITabChild)
   NS_INTERFACE_MAP_ENTRY(nsIObserver)
   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
   NS_INTERFACE_MAP_ENTRY(nsITooltipListener)
 NS_INTERFACE_MAP_END_INHERITING(TabChildBase)
 NS_IMPL_ADDREF_INHERITED(TabChild, TabChildBase);
 NS_IMPL_RELEASE_INHERITED(TabChild, TabChildBase);
 NS_IMETHODIMP
 TabChild::SetStatus(uint32_t aStatusType, const char16_t* aStatus)
 {
   return SetStatusWithContext(aStatusType,
       aStatus ? static_cast<const nsString &>(nsDependentString(aStatus))
               : EmptyString(),
       nullptr);
 }
 NS_IMETHODIMP
 TabChild::GetWebBrowser(nsIWebBrowser** aWebBrowser)
 {
   NS_NOTREACHED("TabChild::GetWebBrowser not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::SetWebBrowser(nsIWebBrowser* aWebBrowser)
 {
   NS_NOTREACHED("TabChild::SetWebBrowser not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::GetChromeFlags(uint32_t* aChromeFlags)
 {
   *aChromeFlags = mChromeFlags;
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::SetChromeFlags(uint32_t aChromeFlags)
 {
   NS_NOTREACHED("trying to SetChromeFlags from content process?");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::DestroyBrowserWindow()
 {
   NS_NOTREACHED("TabChild::DestroyBrowserWindow not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::SizeBrowserTo(int32_t aCX, int32_t aCY)
 {
   NS_NOTREACHED("TabChild::SizeBrowserTo not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::ShowAsModal()
 {
   NS_NOTREACHED("TabChild::ShowAsModal not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::IsWindowModal(bool* aRetVal)
 {
   *aRetVal = false;
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::ExitModalEventLoop(nsresult aStatus)
 {
   NS_NOTREACHED("TabChild::ExitModalEventLoop not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::SetStatusWithContext(uint32_t aStatusType,
                                const nsAString& aStatusText,
                                nsISupports* aStatusContext)
 {
   // We can only send the status after the ipc machinery is set up,
   // mRemoteFrame is a good indicator.
   if (mRemoteFrame)
     SendSetStatus(aStatusType, nsString(aStatusText));
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::SetDimensions(uint32_t aFlags, int32_t aX, int32_t aY,
                              int32_t aCx, int32_t aCy)
 {
   NS_NOTREACHED("TabChild::SetDimensions not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::GetDimensions(uint32_t aFlags, int32_t* aX,
                              int32_t* aY, int32_t* aCx, int32_t* aCy)
 {
   if (aX) {
     *aX = mOuterRect.x;
   }
   if (aY) {
     *aY = mOuterRect.y;
   }
   if (aCx) {
     *aCx = mOuterRect.width;
   }
   if (aCy) {
     *aCy = mOuterRect.height;
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::SetFocus()
 {
   NS_WARNING("TabChild::SetFocus not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::GetVisibility(bool* aVisibility)
 {
   *aVisibility = true;
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::SetVisibility(bool aVisibility)
 {
   // should the platform support this? Bug 666365
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::GetTitle(char16_t** aTitle)
 {
   NS_NOTREACHED("TabChild::GetTitle not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::SetTitle(const char16_t* aTitle)
 {
   // JavaScript sends the "DOMTitleChanged" event to the parent
   // via the message manager.
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::GetSiteWindow(void** aSiteWindow)
 {
   NS_NOTREACHED("TabChild::GetSiteWindow not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::Blur()
 {
   NS_WARNING("TabChild::Blur not supported in TabChild");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 TabChild::FocusNextElement()
 {
   SendMoveFocus(true);
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::FocusPrevElement()
 {
   SendMoveFocus(false);
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::GetInterface(const nsIID & aIID, void **aSink)
 {
     // XXXbz should we restrict the set of interfaces we hand out here?
     // See bug 537429
     return QueryInterface(aIID, aSink);
 }
 NS_IMETHODIMP
 TabChild::ProvideWindow(nsIDOMWindow* aParent, uint32_t aChromeFlags,
                         bool aCalledFromJS,
                         bool aPositionSpecified, bool aSizeSpecified,
                         nsIURI* aURI, const nsAString& aName,
                         const nsACString& aFeatures, bool* aWindowIsNew,
                         nsIDOMWindow** aReturn)
 {
     *aReturn = nullptr;
     // If aParent is inside an <iframe mozbrowser> or <iframe mozapp> and this
     // isn't a request to open a modal-type window, we're going to create a new
     // <iframe mozbrowser/mozapp> and return its window here.
     nsCOMPtr<nsIDocShell> docshell = do_GetInterface(aParent);
     if (docshell && docshell->GetIsInBrowserOrApp() &&
         !(aChromeFlags & (nsIWebBrowserChrome::CHROME_MODAL |
                           nsIWebBrowserChrome::CHROME_OPENAS_DIALOG |
                           nsIWebBrowserChrome::CHROME_OPENAS_CHROME))) {
       // Note that BrowserFrameProvideWindow may return NS_ERROR_ABORT if the
       // open window call was canceled.  It's important that we pass this error
       // code back to our caller.
       return BrowserFrameProvideWindow(aParent, aURI, aName, aFeatures,
                                        aWindowIsNew, aReturn);
     }
     // Otherwise, create a new top-level window.
     PBrowserChild* newChild;
     if (!CallCreateWindow(&newChild)) {
         return NS_ERROR_NOT_AVAILABLE;
     }
     *aWindowIsNew = true;
     nsCOMPtr<nsIDOMWindow> win =
         do_GetInterface(static_cast<TabChild*>(newChild)->WebNavigation());
     win.forget(aReturn);
     return NS_OK;
 }
 nsresult
 TabChild::BrowserFrameProvideWindow(nsIDOMWindow* aOpener,
                                     nsIURI* aURI,
                                     const nsAString& aName,
                                     const nsACString& aFeatures,
                                     bool* aWindowIsNew,
                                     nsIDOMWindow** aReturn)
 {
   *aReturn = nullptr;
   nsRefPtr<TabChild> newChild =
       new TabChild(ContentChild::GetSingleton(),
                    /* TabContext */ *this, /* chromeFlags */ 0);
   if (!NS_SUCCEEDED(newChild->Init())) {
       return NS_ERROR_ABORT;
   }
   // We must use PopupIPCTabContext here; ContentParent will not accept the
   // result of this->AsIPCTabContext() (which will be a
   // BrowserFrameIPCTabContext or an AppFrameIPCTabContext), for security
   // reasons.
   PopupIPCTabContext context;
   context.openerChild() = this;
   context.isBrowserElement() = IsBrowserElement();
   unused << Manager()->SendPBrowserConstructor(
       // We release this ref in DeallocPBrowserChild
       nsRefPtr<TabChild>(newChild).forget().take(),
       IPCTabContext(context, mScrolling), /* chromeFlags */ 0);
   nsAutoCString spec;
   if (aURI) {
     aURI->GetSpec(spec);
   }
   NS_ConvertUTF8toUTF16 url(spec);
   nsString name(aName);
   NS_ConvertUTF8toUTF16 features(aFeatures);
   newChild->SendBrowserFrameOpenWindow(this, url, name,
                                        features, aWindowIsNew);
   if (!*aWindowIsNew) {
     PBrowserChild::Send__delete__(newChild);
     return NS_ERROR_ABORT;
   }
   // Unfortunately we don't get a window unless we've shown the frame.  That's
   // pretty bogus; see bug 763602.
   newChild->DoFakeShow();
   nsCOMPtr<nsIDOMWindow> win = do_GetInterface(newChild->WebNavigation());
   win.forget(aReturn);
   return NS_OK;
 }
 #ifdef DEBUG
 PContentPermissionRequestChild*
 TabChild:: SendPContentPermissionRequestConstructor(PContentPermissionRequestChild* aActor,
                                                     const InfallibleTArray<PermissionRequest>& aRequests,
                                                     const IPC::Principal& aPrincipal)
 {
   PCOMContentPermissionRequestChild* child = static_cast<PCOMContentPermissionRequestChild*>(aActor);
   PContentPermissionRequestChild* request = PBrowserChild::SendPContentPermissionRequestConstructor(aActor, aRequests, aPrincipal);
   child->mIPCOpen = true;
   return request;
 }
 #endif /* DEBUG */
 void
 TabChild::DestroyWindow()
 {
     nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(WebNavigation());
     if (baseWindow)
         baseWindow->Destroy();
     // NB: the order of mWidget->Destroy() and mRemoteFrame->Destroy()
     // is important: we want to kill off remote layers before their
     // frames
     if (mWidget) {
         mWidget->Destroy();
     }
     if (mRemoteFrame) {
         mRemoteFrame->Destroy();
         mRemoteFrame = nullptr;
     }
     if (mLayersId != 0) {
       MOZ_ASSERT(sTabChildren);
       sTabChildren->Remove(mLayersId);
       if (!sTabChildren->Count()) {
         delete sTabChildren;
         sTabChildren = nullptr;
       }
       mLayersId = 0;
     }
 }
 bool
 TabChild::UseDirectCompositor()
 {
     return !!CompositorChild::Get();
 }
 void
 TabChild::ActorDestroy(ActorDestroyReason why)
 {
   if (mTabChildGlobal) {
     // The messageManager relays messages via the TabChild which
     // no longer exists.
     static_cast<nsFrameMessageManager*>
       (mTabChildGlobal->mMessageManager.get())->Disconnect();
     mTabChildGlobal->mMessageManager = nullptr;
   }
 }
 TabChild::~TabChild()
 {
     DestroyWindow();
     nsCOMPtr<nsIWebBrowser> webBrowser = do_QueryInterface(WebNavigation());
     if (webBrowser) {
       webBrowser->SetContainerWindow(nullptr);
     }
 }
 void
 TabChild::SetProcessNameToAppName()
 {
   nsCOMPtr<mozIApplication> app = GetOwnApp();
   if (!app) {
     return;
   }
   nsAutoString appName;
   nsresult rv = app->GetName(appName);
   if (NS_FAILED(rv)) {
     NS_WARNING("Failed to retrieve app name");
     return;
   }
   ContentChild::GetSingleton()->SetProcessName(appName, true);
 }
 bool
 TabChild::IsRootContentDocument()
 {
     // A TabChild is a "root content document" if it's
     //
     //  - <iframe mozapp> not inside another <iframe mozapp>,
     //  - <iframe mozbrowser> (not mozapp), or
     //  - a vanilla remote frame (<html:iframe remote=true> or <xul:browser
     //    remote=true>).
     //
     // Put another way, an iframe is /not/ a "root content document" iff it's a
     // mozapp inside a mozapp.  (This corresponds exactly to !HasAppOwnerApp.)
     //
     // Note that we're lying through our teeth here (thus the scare quotes).
     // <html:iframe remote=true> or <xul:browser remote=true> inside another
     // content iframe is not actually a root content document, but we say it is.
     //
     // We do this because we make a remote frame opaque iff
     // IsRootContentDocument(), and making vanilla remote frames transparent
     // breaks our remote reftests.
     return !HasAppOwnerApp();
 }
 bool
 TabChild::RecvLoadURL(const nsCString& uri)
 {
     SetProcessNameToAppName();
     nsresult rv = WebNavigation()->LoadURI(NS_ConvertUTF8toUTF16(uri).get(),
                                            nsIWebNavigation::LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
                                            nsIWebNavigation::LOAD_FLAGS_DISALLOW_INHERIT_OWNER,
                                            nullptr, nullptr, nullptr);
     if (NS_FAILED(rv)) {
         NS_WARNING("WebNavigation()->LoadURI failed. Eating exception, what else can I do?");
     }
 #ifdef MOZ_CRASHREPORTER
     CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("URL"), uri);
 #endif
     return true;
 }
 bool
 TabChild::RecvCacheFileDescriptor(const nsString& aPath,
                                   const FileDescriptor& aFileDescriptor)
 {
     MOZ_ASSERT(NS_IsMainThread());
     MOZ_ASSERT(!aPath.IsEmpty());
     MOZ_ASSERT(!mAppPackageFileDescriptorRecved);
     mAppPackageFileDescriptorRecved = true;
     // aFileDescriptor may be invalid here, but the callback will choose how to
     // handle it.
     // First see if we already have a request for this path.
     const CachedFileDescriptorInfo search(aPath);
     uint32_t index =
         mCachedFileDescriptorInfos.IndexOf(search, 0,
                                            search.PathOnlyComparator());
     if (index == mCachedFileDescriptorInfos.NoIndex) {
         // We haven't had any requests for this path yet. Assume that we will
         // in a little while and save the file descriptor here.
         mCachedFileDescriptorInfos.AppendElement(
             new CachedFileDescriptorInfo(aPath, aFileDescriptor));
         return true;
     }
     nsAutoPtr<CachedFileDescriptorInfo>& info =
         mCachedFileDescriptorInfos[index];
     MOZ_ASSERT(info);
     MOZ_ASSERT(info->mPath == aPath);
     MOZ_ASSERT(!info->mFileDescriptor.IsValid());
     MOZ_ASSERT(info->mCallback);
     // If this callback has been canceled then we can simply close the file
     // descriptor and forget about the callback.
     if (info->mCanceled) {
         // Only close if this is a valid file descriptor.
         if (aFileDescriptor.IsValid()) {
             nsRefPtr<CloseFileRunnable> runnable =
                 new CloseFileRunnable(aFileDescriptor);
             runnable->Dispatch();
         }
     } else {
         // Not canceled so fire the callback.
         info->mFileDescriptor = aFileDescriptor;
         // We don't need a runnable here because we should already be at the top
         // of the event loop. Just fire immediately.
         info->FireCallback();
     }
     mCachedFileDescriptorInfos.RemoveElementAt(index);
     return true;
 }
 bool
 TabChild::GetCachedFileDescriptor(const nsAString& aPath,
                                   nsICachedFileDescriptorListener* aCallback)
 {
     MOZ_ASSERT(NS_IsMainThread());
     MOZ_ASSERT(!aPath.IsEmpty());
     MOZ_ASSERT(aCallback);
     // First see if we've already received a cached file descriptor for this
     // path.
     const CachedFileDescriptorInfo search(aPath);
     uint32_t index =
         mCachedFileDescriptorInfos.IndexOf(search, 0,
                                            search.PathOnlyComparator());
     if (index == mCachedFileDescriptorInfos.NoIndex) {
         // We haven't received a file descriptor for this path yet. Assume that
         // we will in a little while and save the request here.
         if (!mAppPackageFileDescriptorRecved) {
           mCachedFileDescriptorInfos.AppendElement(
               new CachedFileDescriptorInfo(aPath, aCallback));
         }
         return false;
     }
     nsAutoPtr<CachedFileDescriptorInfo>& info =
         mCachedFileDescriptorInfos[index];
     MOZ_ASSERT(info);
     MOZ_ASSERT(info->mPath == aPath);
     // If we got a previous request for this file descriptor that was then
     // canceled, insert the new request ahead of the old in the queue so that
     // it will be serviced first.
     if (info->mCanceled) {
         // This insertion will change the array and invalidate |info|, so
         // be careful not to touch |info| after this.
         mCachedFileDescriptorInfos.InsertElementAt(index,
             new CachedFileDescriptorInfo(aPath, aCallback));
         return false;
     }
     MOZ_ASSERT(!info->mCallback);
     info->mCallback = aCallback;
     nsRefPtr<CachedFileDescriptorCallbackRunnable> runnable =
         new CachedFileDescriptorCallbackRunnable(info.forget());
     runnable->Dispatch();
     mCachedFileDescriptorInfos.RemoveElementAt(index);
     return true;
 }
 void
 TabChild::CancelCachedFileDescriptorCallback(
                                      const nsAString& aPath,
                                      nsICachedFileDescriptorListener* aCallback)
 {
     MOZ_ASSERT(NS_IsMainThread());
     MOZ_ASSERT(!aPath.IsEmpty());
     MOZ_ASSERT(aCallback);
     if (mAppPackageFileDescriptorRecved) {
       // Already received cached file descriptor for the app package. Nothing to do here.
       return;
     }
     const CachedFileDescriptorInfo search(aPath, aCallback);
     uint32_t index =
         mCachedFileDescriptorInfos.IndexOf(search, 0,
                                            search.PathAndCallbackComparator());
     if (index == mCachedFileDescriptorInfos.NoIndex) {
         // Nothing to do here.
         return;
     }
     nsAutoPtr<CachedFileDescriptorInfo>& info =
         mCachedFileDescriptorInfos[index];
     MOZ_ASSERT(info);
     MOZ_ASSERT(info->mPath == aPath);
     MOZ_ASSERT(!info->mFileDescriptor.IsValid());
     MOZ_ASSERT(info->mCallback == aCallback);
     MOZ_ASSERT(!info->mCanceled);
     // Set this flag so that we will close the file descriptor when it arrives.
     info->mCanceled = true;
 }
 void
 TabChild::DoFakeShow()
 {
   RecvShow(nsIntSize(0, 0));
   mDidFakeShow = true;
 }
 bool
 TabChild::RecvShow(const nsIntSize& size)
 {
     if (mDidFakeShow) {
         return true;
     }
     nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(WebNavigation());
     if (!baseWindow) {
         NS_ERROR("WebNavigation() doesn't QI to nsIBaseWindow");
         return false;
     }
     if (!InitRenderingState()) {
         // We can fail to initialize our widget if the <browser
         // remote> has already been destroyed, and we couldn't hook
         // into the parent-process's layer system.  That's not a fatal
         // error.
         return true;
     }
     baseWindow->SetVisibility(true);
     return InitTabChildGlobal();
 }
 bool
 TabChild::RecvUpdateDimensions(const nsRect& rect, const nsIntSize& size, const ScreenOrientation& orientation)
 {
     if (!mRemoteFrame) {
         return true;
     }
     mOuterRect.x = rect.x;
     mOuterRect.y = rect.y;
     mOuterRect.width = rect.width;
     mOuterRect.height = rect.height;
     bool initialSizing = !HasValidInnerSize()
                       && (size.width != 0 && size.height != 0);
     mOrientation = orientation;
     mInnerSize = ScreenIntSize::FromUnknownSize(
       gfx::IntSize(size.width, size.height));
     mWidget->Resize(0, 0, size.width, size.height,
                     true);
     nsCOMPtr<nsIBaseWindow> baseWin = do_QueryInterface(WebNavigation());
     baseWin->SetPositionAndSize(0, 0, size.width, size.height,
                                 true);
     if (initialSizing && mContentDocumentIsDisplayed) {
       // If this is the first time we're getting a valid mInnerSize, and the
       // before-first-paint event has already been handled, then we need to set
       // up our default viewport here. See the corresponding call to
       // InitializeRootMetrics in the before-first-paint handler.
       InitializeRootMetrics();
     }
     HandlePossibleViewportChange();
     return true;
 }
 bool
 TabChild::RecvUpdateFrame(const FrameMetrics& aFrameMetrics)
 {
   return TabChildBase::UpdateFrameHandler(aFrameMetrics);
 }
 bool
 TabChild::RecvAcknowledgeScrollUpdate(const ViewID& aScrollId,
                                       const uint32_t& aScrollGeneration)
 {
   APZCCallbackHelper::AcknowledgeScrollUpdate(aScrollId, aScrollGeneration);
   return true;
 }
 bool
 TabChild::RecvHandleDoubleTap(const CSSPoint& aPoint, const ScrollableLayerGuid& aGuid)
 {
     if (!mGlobal || !mTabChildGlobal) {
         return true;
     }
     CSSPoint point = APZCCallbackHelper::ApplyCallbackTransform(aPoint, aGuid);
     nsString data;
     data.AppendLiteral("{ \"x\" : ");
     data.AppendFloat(point.x);
     data.AppendLiteral(", \"y\" : ");
     data.AppendFloat(point.y);
     data.AppendLiteral(" }");
     DispatchMessageManagerMessage(NS_LITERAL_STRING("Gesture:DoubleTap"), data);
     return true;
 }
 bool
 TabChild::RecvHandleSingleTap(const CSSPoint& aPoint, const ScrollableLayerGuid& aGuid)
 {
   if (!mGlobal || !mTabChildGlobal) {
     return true;
   }
   LayoutDevicePoint currentPoint = APZCCallbackHelper::ApplyCallbackTransform(aPoint, aGuid) * mWidget->GetDefaultScale();;
   MessageLoop::current()->PostDelayedTask(
     FROM_HERE,
     NewRunnableMethod(this, &TabChild::FireSingleTapEvent, currentPoint),
     sActiveDurationMs);
   return true;
 }
 void
 TabChild::FireSingleTapEvent(LayoutDevicePoint aPoint)
 {
   int time = 0;
   DispatchSynthesizedMouseEvent(NS_MOUSE_MOVE, time, aPoint, mWidget);
   DispatchSynthesizedMouseEvent(NS_MOUSE_BUTTON_DOWN, time, aPoint, mWidget);
   DispatchSynthesizedMouseEvent(NS_MOUSE_BUTTON_UP, time, aPoint, mWidget);
 }
 bool
 TabChild::RecvHandleLongTap(const CSSPoint& aPoint, const ScrollableLayerGuid& aGuid)
 {
   if (!mGlobal || !mTabChildGlobal) {
     return true;
   }
   mContextMenuHandled =
       DispatchMouseEvent(NS_LITERAL_STRING("contextmenu"),
                          APZCCallbackHelper::ApplyCallbackTransform(aPoint, aGuid),
 , 1, 0, false,
                          nsIDOMMouseEvent::MOZ_SOURCE_TOUCH);
   SendContentReceivedTouch(aGuid, mContextMenuHandled);
   return true;
 }
 bool
 TabChild::RecvHandleLongTapUp(const CSSPoint& aPoint, const ScrollableLayerGuid& aGuid)
 {
   if (mContextMenuHandled) {
     mContextMenuHandled = false;
     return true;
   }
   RecvHandleSingleTap(aPoint, aGuid);
   return true;
 }
 bool
 TabChild::RecvNotifyAPZStateChange(const ViewID& aViewId,
                                    const APZStateChange& aChange,
                                    const int& aArg)
 {
   switch (aChange)
   {
   case APZStateChange::TransformBegin:
   {
     nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
     nsIScrollbarOwner* scrollbarOwner = do_QueryFrame(sf);
     if (scrollbarOwner) {
       scrollbarOwner->ScrollbarActivityStarted();
     }
     break;
   }
   case APZStateChange::TransformEnd:
   {
     nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
     nsIScrollbarOwner* scrollbarOwner = do_QueryFrame(sf);
     if (scrollbarOwner) {
       scrollbarOwner->ScrollbarActivityStopped();
     }
     break;
   }
   case APZStateChange::StartTouch:
   {
     mActiveElementManager->HandleTouchStart(aArg);
     break;
   }
   case APZStateChange::StartPanning:
   {
     mActiveElementManager->HandlePanStart();
     break;
   }
   case APZStateChange::EndTouch:
   {
     mActiveElementManager->HandleTouchEnd(aArg);
     break;
   }
   default:
     // APZStateChange has a 'sentinel' value, and the compiler complains
     // if an enumerator is not handled and there is no 'default' case.
     break;
   }
   return true;
 }
 bool
 TabChild::RecvActivate()
 {
   nsCOMPtr<nsIWebBrowserFocus> browser = do_QueryInterface(WebNavigation());
   browser->Activate();
   return true;
 }
 bool TabChild::RecvDeactivate()
 {
   nsCOMPtr<nsIWebBrowserFocus> browser = do_QueryInterface(WebNavigation());
   browser->Deactivate();
   return true;
 }
 bool
 TabChild::RecvMouseEvent(const nsString& aType,
                          const float&    aX,
                          const float&    aY,
                          const int32_t&  aButton,
                          const int32_t&  aClickCount,
                          const int32_t&  aModifiers,
                          const bool&     aIgnoreRootScrollFrame)
 {
   DispatchMouseEvent(aType, CSSPoint(aX, aY), aButton, aClickCount, aModifiers,
                      aIgnoreRootScrollFrame, nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN);
   return true;
 }
 bool
 TabChild::RecvRealMouseEvent(const WidgetMouseEvent& event)
 {
   WidgetMouseEvent localEvent(event);
   localEvent.widget = mWidget;
   DispatchWidgetEvent(localEvent);
   return true;
 }
 bool
 TabChild::RecvMouseWheelEvent(const WidgetWheelEvent& event)
 {
   WidgetWheelEvent localEvent(event);
   localEvent.widget = mWidget;
   DispatchWidgetEvent(localEvent);
   return true;
 }
 static Touch*
 GetTouchForIdentifier(const WidgetTouchEvent& aEvent, int32_t aId)
 {
   for (uint32_t i = 0; i < aEvent.touches.Length(); ++i) {
     Touch* touch = static_cast<Touch*>(aEvent.touches[i].get());
     if (touch->mIdentifier == aId) {
       return touch;
     }
   }
   return nullptr;
 }
 void
 TabChild::UpdateTapState(const WidgetTouchEvent& aEvent, nsEventStatus aStatus)
 {
   static bool sHavePrefs;
   static bool sClickHoldContextMenusEnabled;
   static nsIntSize sDragThreshold;
   static int32_t sContextMenuDelayMs;
   if (!sHavePrefs) {
     sHavePrefs = true;
     Preferences::AddBoolVarCache(&sClickHoldContextMenusEnabled,
                                  "ui.click_hold_context_menus", true);
     Preferences::AddIntVarCache(&sDragThreshold.width,
                                 "ui.dragThresholdX", 25);
     Preferences::AddIntVarCache(&sDragThreshold.height,
                                 "ui.dragThresholdY", 25);
     Preferences::AddIntVarCache(&sContextMenuDelayMs,
                                 "ui.click_hold_context_menus.delay", 500);
   }
   if (aEvent.touches.Length() == 0) {
     return;
   }
   bool currentlyTrackingTouch = (mActivePointerId >= 0);
   if (aEvent.message == NS_TOUCH_START) {
     if (currentlyTrackingTouch || aEvent.touches.Length() > 1) {
       // We're tracking a possible tap for another point, or we saw a
       // touchstart for a later pointer after we canceled tracking of
       // the first point.  Ignore this one.
       return;
     }
     if (aStatus == nsEventStatus_eConsumeNoDefault ||
         nsIPresShell::gPreventMouseEvents ||
         aEvent.mFlags.mMultipleActionsPrevented) {
       return;
     }
     Touch* touch = aEvent.touches[0];
     mGestureDownPoint = LayoutDevicePoint(touch->mRefPoint.x, touch->mRefPoint.y);
     mActivePointerId = touch->mIdentifier;
     if (sClickHoldContextMenusEnabled) {
       MOZ_ASSERT(!mTapHoldTimer);
       mTapHoldTimer = NewRunnableMethod(this,
                                         &TabChild::FireContextMenuEvent);
       MessageLoop::current()->PostDelayedTask(FROM_HERE, mTapHoldTimer,
                                               sContextMenuDelayMs);
     }
     return;
   }
   // If we're not tracking a touch or this event doesn't include the
   // one we care about, bail.
   if (!currentlyTrackingTouch) {
     return;
   }
   Touch* trackedTouch = GetTouchForIdentifier(aEvent, mActivePointerId);
   if (!trackedTouch) {
     return;
   }
   LayoutDevicePoint currentPoint = LayoutDevicePoint(trackedTouch->mRefPoint.x, trackedTouch->mRefPoint.y);
   int64_t time = aEvent.time;
   switch (aEvent.message) {
   case NS_TOUCH_MOVE:
     if (abs(currentPoint.x - mGestureDownPoint.x) > sDragThreshold.width ||
         abs(currentPoint.y - mGestureDownPoint.y) > sDragThreshold.height) {
       CancelTapTracking();
     }
     return;
   case NS_TOUCH_END:
     if (!nsIPresShell::gPreventMouseEvents) {
       DispatchSynthesizedMouseEvent(NS_MOUSE_MOVE, time, currentPoint, mWidget);
       DispatchSynthesizedMouseEvent(NS_MOUSE_BUTTON_DOWN, time, currentPoint, mWidget);
       DispatchSynthesizedMouseEvent(NS_MOUSE_BUTTON_UP, time, currentPoint, mWidget);
     }
     // fall through
   case NS_TOUCH_CANCEL:
     CancelTapTracking();
     return;
   default:
     NS_WARNING("Unknown touch event type");
   }
 }
 void
 TabChild::FireContextMenuEvent()
 {
   double scale;
   GetDefaultScale(&scale);
   if (scale < 0) {
     scale = 1;
   }
   MOZ_ASSERT(mTapHoldTimer && mActivePointerId >= 0);
   bool defaultPrevented = DispatchMouseEvent(NS_LITERAL_STRING("contextmenu"),
                                              mGestureDownPoint / CSSToLayoutDeviceScale(scale),
 /* Right button */,
 /* Click count */,
 /* Modifiers */,
                                              false /* Ignore root scroll frame */,
                                              nsIDOMMouseEvent::MOZ_SOURCE_TOUCH);
   // Fire a click event if someone didn't call preventDefault() on the context
   // menu event.
   if (defaultPrevented) {
     CancelTapTracking();
   } else if (mTapHoldTimer) {
     mTapHoldTimer->Cancel();
     mTapHoldTimer = nullptr;
   }
 }
 void
 TabChild::CancelTapTracking()
 {
   mActivePointerId = -1;
   if (mTapHoldTimer) {
     mTapHoldTimer->Cancel();
   }
   mTapHoldTimer = nullptr;
 }
 bool
 TabChild::RecvRealTouchEvent(const WidgetTouchEvent& aEvent,
                              const ScrollableLayerGuid& aGuid)
 {
   WidgetTouchEvent localEvent(aEvent);
   localEvent.widget = mWidget;
   for (size_t i = 0; i < localEvent.touches.Length(); i++) {
     aEvent.touches[i]->mRefPoint = APZCCallbackHelper::ApplyCallbackTransform(aEvent.touches[i]->mRefPoint, aGuid, mWidget->GetDefaultScale());
   }
   nsEventStatus status = DispatchWidgetEvent(localEvent);
   if (!IsAsyncPanZoomEnabled()) {
     UpdateTapState(localEvent, status);
     return true;
   }
   if (aEvent.message == NS_TOUCH_START && localEvent.touches.Length() > 0) {
     mActiveElementManager->SetTargetElement(localEvent.touches[0]->Target());
   }
   nsCOMPtr<nsPIDOMWindow> outerWindow = do_GetInterface(WebNavigation());
   nsCOMPtr<nsPIDOMWindow> innerWindow = outerWindow->GetCurrentInnerWindow();
   if (!innerWindow || !innerWindow->HasTouchEventListeners()) {
     SendContentReceivedTouch(aGuid, false);
     return true;
   }
   bool isTouchPrevented = nsIPresShell::gPreventMouseEvents ||
                           localEvent.mFlags.mMultipleActionsPrevented;
   switch (aEvent.message) {
   case NS_TOUCH_START: {
     if (isTouchPrevented) {
       SendContentReceivedTouch(aGuid, isTouchPrevented);
     } else {
       mWaitingTouchListeners = true;
     }
     break;
   }
   case NS_TOUCH_MOVE:
   case NS_TOUCH_END:
   case NS_TOUCH_CANCEL: {
     if (mWaitingTouchListeners) {
       SendContentReceivedTouch(aGuid, isTouchPrevented);
       mWaitingTouchListeners = false;
     }
     break;
   }
   default:
     NS_WARNING("Unknown touch event type");
   }
   return true;
 }
 bool
 TabChild::RecvRealTouchMoveEvent(const WidgetTouchEvent& aEvent,
                                  const ScrollableLayerGuid& aGuid)
 {
   return RecvRealTouchEvent(aEvent, aGuid);
 }
 void
 TabChild::RequestNativeKeyBindings(AutoCacheNativeKeyCommands* aAutoCache,
                                    WidgetKeyboardEvent* aEvent)
 {
   MaybeNativeKeyBinding maybeBindings;
   if (!SendRequestNativeKeyBindings(*aEvent, &maybeBindings)) {
     return;
   }
   if (maybeBindings.type() == MaybeNativeKeyBinding::TNativeKeyBinding) {
     const NativeKeyBinding& bindings = maybeBindings;
     aAutoCache->Cache(bindings.singleLineCommands(),
                       bindings.multiLineCommands(),
                       bindings.richTextCommands());
   } else {
     aAutoCache->CacheNoCommands();
   }
 }
 bool
 TabChild::RecvRealKeyEvent(const WidgetKeyboardEvent& event,
                            const MaybeNativeKeyBinding& aBindings)
 {
   PuppetWidget* widget = static_cast<PuppetWidget*>(mWidget.get());
   AutoCacheNativeKeyCommands autoCache(widget);
   if (event.message == NS_KEY_PRESS) {
     if (aBindings.type() == MaybeNativeKeyBinding::TNativeKeyBinding) {
       const NativeKeyBinding& bindings = aBindings;
       autoCache.Cache(bindings.singleLineCommands(),
                       bindings.multiLineCommands(),
                       bindings.richTextCommands());
     } else {
       autoCache.CacheNoCommands();
     }
   }
   // If content code called preventDefault() on a keydown event, then we don't
   // want to process any following keypress events.
   if (event.message == NS_KEY_PRESS && mIgnoreKeyPressEvent) {
     return true;
   }
   WidgetKeyboardEvent localEvent(event);
   localEvent.widget = mWidget;
   nsEventStatus status = DispatchWidgetEvent(localEvent);
   if (event.message == NS_KEY_DOWN) {
     mIgnoreKeyPressEvent = status == nsEventStatus_eConsumeNoDefault;
   }
   if (localEvent.mFlags.mWantReplyFromContentProcess) {
     SendReplyKeyEvent(localEvent);
   }
   return true;
 }
 bool
 TabChild::RecvKeyEvent(const nsString& aType,
                        const int32_t& aKeyCode,
                        const int32_t& aCharCode,
                        const int32_t& aModifiers,
                        const bool& aPreventDefault)
 {
   nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
   NS_ENSURE_TRUE(utils, true);
   bool ignored = false;
   utils->SendKeyEvent(aType, aKeyCode, aCharCode,
                       aModifiers, aPreventDefault, &ignored);
   return true;
 }
 bool
 TabChild::RecvCompositionEvent(const WidgetCompositionEvent& event)
 {
   WidgetCompositionEvent localEvent(event);
   localEvent.widget = mWidget;
   DispatchWidgetEvent(localEvent);
   return true;
 }
 bool
 TabChild::RecvTextEvent(const WidgetTextEvent& event)
 {
   WidgetTextEvent localEvent(event);
   localEvent.widget = mWidget;
   DispatchWidgetEvent(localEvent);
   return true;
 }
 bool
 TabChild::RecvSelectionEvent(const WidgetSelectionEvent& event)
 {
   WidgetSelectionEvent localEvent(event);
   localEvent.widget = mWidget;
   DispatchWidgetEvent(localEvent);
   return true;
 }
 PDocumentRendererChild*
 TabChild::AllocPDocumentRendererChild(const nsRect& documentRect,
                                       const mozilla::gfx::Matrix& transform,
                                       const nsString& bgcolor,
                                       const uint32_t& renderFlags,
                                       const bool& flushLayout,
                                       const nsIntSize& renderSize)
 {
     return new DocumentRendererChild();
 }
 bool
 TabChild::DeallocPDocumentRendererChild(PDocumentRendererChild* actor)
 {
     delete actor;
     return true;
 }
 bool
 TabChild::RecvPDocumentRendererConstructor(PDocumentRendererChild* actor,
                                            const nsRect& documentRect,
                                            const mozilla::gfx::Matrix& transform,
                                            const nsString& bgcolor,
                                            const uint32_t& renderFlags,
                                            const bool& flushLayout,
                                            const nsIntSize& renderSize)
 {
     DocumentRendererChild *render = static_cast<DocumentRendererChild *>(actor);
     nsCOMPtr<nsIWebBrowser> browser = do_QueryInterface(WebNavigation());
     if (!browser)
         return true; // silently ignore
     nsCOMPtr<nsIDOMWindow> window;
     if (NS_FAILED(browser->GetContentDOMWindow(getter_AddRefs(window))) ||
         !window)
     {
         return true; // silently ignore
     }
     nsCString data;
     bool ret = render->RenderDocument(window,
                                       documentRect, transform,
                                       bgcolor,
                                       renderFlags, flushLayout,
                                       renderSize, data);
     if (!ret)
         return true; // silently ignore
     return PDocumentRendererChild::Send__delete__(actor, renderSize, data);
 }
 PColorPickerChild*
 TabChild::AllocPColorPickerChild(const nsString&, const nsString&)
 {
   NS_RUNTIMEABORT("unused");
   return nullptr;
 }
 bool
 TabChild::DeallocPColorPickerChild(PColorPickerChild* aColorPicker)
 {
   nsColorPickerProxy* picker = static_cast<nsColorPickerProxy*>(aColorPicker);
   NS_RELEASE(picker);
   return true;
 }
 PContentPermissionRequestChild*
 TabChild::AllocPContentPermissionRequestChild(const InfallibleTArray<PermissionRequest>& aRequests,
                                               const IPC::Principal& aPrincipal)
 {
   NS_RUNTIMEABORT("unused");
   return nullptr;
 }
 bool
 TabChild::DeallocPContentPermissionRequestChild(PContentPermissionRequestChild* actor)
 {
     PCOMContentPermissionRequestChild* child =
         static_cast<PCOMContentPermissionRequestChild*>(actor);
 #ifdef DEBUG
     child->mIPCOpen = false;
 #endif /* DEBUG */
     child->IPDLRelease();
     return true;
 }
 PFilePickerChild*
 TabChild::AllocPFilePickerChild(const nsString&, const int16_t&)
 {
   NS_RUNTIMEABORT("unused");
   return nullptr;
 }
 bool
 TabChild::DeallocPFilePickerChild(PFilePickerChild* actor)
 {
   nsFilePickerProxy* filePicker = static_cast<nsFilePickerProxy*>(actor);
   NS_RELEASE(filePicker);
   return true;
 }
 bool
 TabChild::RecvActivateFrameEvent(const nsString& aType, const bool& capture)
 {
   nsCOMPtr<nsPIDOMWindow> window = do_GetInterface(WebNavigation());
   NS_ENSURE_TRUE(window, true);
   nsCOMPtr<EventTarget> chromeHandler =
     do_QueryInterface(window->GetChromeEventHandler());
   NS_ENSURE_TRUE(chromeHandler, true);
   nsRefPtr<ContentListener> listener = new ContentListener(this);
   chromeHandler->AddEventListener(aType, listener, capture);
   return true;
 }
 POfflineCacheUpdateChild*
 TabChild::AllocPOfflineCacheUpdateChild(const URIParams& manifestURI,
                                         const URIParams& documentURI,
                                         const bool& stickDocument)
 {
   NS_RUNTIMEABORT("unused");
   return nullptr;
 }
 bool
 TabChild::DeallocPOfflineCacheUpdateChild(POfflineCacheUpdateChild* actor)
 {
   OfflineCacheUpdateChild* offlineCacheUpdate = static_cast<OfflineCacheUpdateChild*>(actor);
   NS_RELEASE(offlineCacheUpdate);
   return true;
 }
 bool
 TabChild::RecvLoadRemoteScript(const nsString& aURL, const bool& aRunInGlobalScope)
 {
   if (!mGlobal && !InitTabChildGlobal())
     // This can happen if we're half-destroyed.  It's not a fatal
     // error.
     return true;
   LoadFrameScriptInternal(aURL, aRunInGlobalScope);
   return true;
 }
 bool
 TabChild::RecvAsyncMessage(const nsString& aMessage,
                            const ClonedMessageData& aData,
                            const InfallibleTArray<CpowEntry>& aCpows,
                            const IPC::Principal& aPrincipal)
 {
   if (mTabChildGlobal) {
     nsCOMPtr<nsIXPConnectJSObjectHolder> kungFuDeathGrip(GetGlobal());
     StructuredCloneData cloneData = UnpackClonedMessageDataForChild(aData);
     nsRefPtr<nsFrameMessageManager> mm =
       static_cast<nsFrameMessageManager*>(mTabChildGlobal->mMessageManager.get());
     CpowIdHolder cpows(static_cast<ContentChild*>(Manager())->GetCPOWManager(), aCpows);
     mm->ReceiveMessage(static_cast<EventTarget*>(mTabChildGlobal),
                        aMessage, false, &cloneData, &cpows, aPrincipal, nullptr);
   }
   return true;
 }
 class UnloadScriptEvent : public nsRunnable
 {
 public:
   UnloadScriptEvent(TabChild* aTabChild, TabChildGlobal* aTabChildGlobal)
     : mTabChild(aTabChild), mTabChildGlobal(aTabChildGlobal)
   { }
   NS_IMETHOD Run()
   {
     nsCOMPtr<nsIDOMEvent> event;
     NS_NewDOMEvent(getter_AddRefs(event), mTabChildGlobal, nullptr, nullptr);
     if (event) {
       event->InitEvent(NS_LITERAL_STRING("unload"), false, false);
       event->SetTrusted(true);
       bool dummy;
       mTabChildGlobal->DispatchEvent(event, &dummy);
     }
     return NS_OK;
   }
   nsRefPtr<TabChild> mTabChild;
   TabChildGlobal* mTabChildGlobal;
 };
 bool
 TabChild::RecvDestroy()
 {
   if (mTabChildGlobal) {
     // Let the frame scripts know the child is being closed
     nsContentUtils::AddScriptRunner(
       new UnloadScriptEvent(this, mTabChildGlobal)
     );
   }
   nsCOMPtr<nsIObserverService> observerService =
     mozilla::services::GetObserverService();
   observerService->RemoveObserver(this, BROWSER_ZOOM_TO_RECT);
   observerService->RemoveObserver(this, BEFORE_FIRST_PAINT);
   const InfallibleTArray<PIndexedDBChild*>& idbActors =
     ManagedPIndexedDBChild();
   for (uint32_t i = 0; i < idbActors.Length(); ++i) {
     static_cast<IndexedDBChild*>(idbActors[i])->Disconnect();
   }
   // XXX what other code in ~TabChild() should we be running here?
   DestroyWindow();
   return Send__delete__(this);
 }
 bool
 TabChild::RecvSetUpdateHitRegion(const bool& aEnabled)
 {
     mUpdateHitRegion = aEnabled;
     return true;
 }
 bool
 TabChild::RecvSetIsDocShellActive(const bool& aIsActive)
 {
     nsCOMPtr<nsIDocShell> docShell = do_GetInterface(WebNavigation());
     if (docShell) {
       docShell->SetIsActive(aIsActive);
     }
     return true;
 }
 PRenderFrameChild*
 TabChild::AllocPRenderFrameChild()
 {
     return new RenderFrameChild();
 }
 bool
 TabChild::DeallocPRenderFrameChild(PRenderFrameChild* aFrame)
 {
     delete aFrame;
     return true;
 }
 bool
 TabChild::InitTabChildGlobal(FrameScriptLoading aScriptLoading)
 {
   if (!mGlobal && !mTabChildGlobal) {
     nsCOMPtr<nsPIDOMWindow> window = do_GetInterface(WebNavigation());
     NS_ENSURE_TRUE(window, false);
     nsCOMPtr<EventTarget> chromeHandler =
       do_QueryInterface(window->GetChromeEventHandler());
     NS_ENSURE_TRUE(chromeHandler, false);
     nsRefPtr<TabChildGlobal> scope = new TabChildGlobal(this);
     mTabChildGlobal = scope;
     nsISupports* scopeSupports = NS_ISUPPORTS_CAST(EventTarget*, scope);
     NS_NAMED_LITERAL_CSTRING(globalId, "outOfProcessTabChildGlobal");
     NS_ENSURE_TRUE(InitTabChildGlobalInternal(scopeSupports, globalId), false);
     scope->Init();
     nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(chromeHandler);
     NS_ENSURE_TRUE(root, false);
     root->SetParentTarget(scope);
     chromeHandler->AddEventListener(NS_LITERAL_STRING("DOMMetaAdded"), this, false);
   }
   if (aScriptLoading != DONT_LOAD_SCRIPTS && !mTriedBrowserInit) {
     mTriedBrowserInit = true;
     // Initialize the child side of the browser element machinery,
     // if appropriate.
     if (IsBrowserOrApp()) {
       RecvLoadRemoteScript(BROWSER_ELEMENT_CHILD_SCRIPT, true);
     }
   }
   return true;
 }
 bool
 TabChild::InitRenderingState()
 {
     static_cast<PuppetWidget*>(mWidget.get())->InitIMEState();
     uint64_t id;
     bool success;
     RenderFrameChild* remoteFrame =
         static_cast<RenderFrameChild*>(SendPRenderFrameConstructor());
     if (!remoteFrame) {
         NS_WARNING("failed to construct RenderFrame");
         return false;
     }
     SendInitRenderFrame(remoteFrame, &mScrolling, &mTextureFactoryIdentifier, &id, &success);
     if (!success) {
         NS_WARNING("failed to construct RenderFrame");
         PRenderFrameChild::Send__delete__(remoteFrame);
         return false;
     }
     PLayerTransactionChild* shadowManager = nullptr;
     if (id != 0) {
         // Pushing layers transactions directly to a separate
         // compositor context.
         PCompositorChild* compositorChild = CompositorChild::Get();
         if (!compositorChild) {
           NS_WARNING("failed to get CompositorChild instance");
           return false;
         }
         nsTArray<LayersBackend> backends;
         backends.AppendElement(mTextureFactoryIdentifier.mParentBackend);
         bool success;
         shadowManager =
             compositorChild->SendPLayerTransactionConstructor(backends,
                                                               id, &mTextureFactoryIdentifier, &success);
         if (!success) {
           NS_WARNING("failed to properly allocate layer transaction");
           return false;
         }
     } else {
         // Pushing transactions to the parent content.
         shadowManager = remoteFrame->SendPLayerTransactionConstructor();
     }
     if (!shadowManager) {
       NS_WARNING("failed to construct LayersChild");
       // This results in |remoteFrame| being deleted.
       PRenderFrameChild::Send__delete__(remoteFrame);
       return false;
     }
     ShadowLayerForwarder* lf =
         mWidget->GetLayerManager(shadowManager, mTextureFactoryIdentifier.mParentBackend)
                ->AsShadowForwarder();
     NS_ABORT_IF_FALSE(lf && lf->HasShadowManager(),
                       "PuppetWidget should have shadow manager");
     lf->IdentifyTextureHost(mTextureFactoryIdentifier);
     ImageBridgeChild::IdentifyCompositorTextureHost(mTextureFactoryIdentifier);
     mRemoteFrame = remoteFrame;
     if (id != 0) {
       if (!sTabChildren) {
         sTabChildren = new TabChildMap;
       }
       sTabChildren->Put(id, this);
       mLayersId = id;
     }
     nsCOMPtr<nsIObserverService> observerService =
         mozilla::services::GetObserverService();
     if (observerService) {
         observerService->AddObserver(this,
                                      BROWSER_ZOOM_TO_RECT,
                                      false);
         observerService->AddObserver(this,
                                      BEFORE_FIRST_PAINT,
                                      false);
     }
     // This state can't change during the lifetime of the child.
     sCpowsEnabled = BrowserTabsRemote();
     if (Preferences::GetBool("dom.ipc.cpows.force-enabled", false))
       sCpowsEnabled = true;
     return true;
 }
 void
 TabChild::SetBackgroundColor(const nscolor& aColor)
 {
   if (mLastBackgroundColor != aColor) {
     mLastBackgroundColor = aColor;
     SendSetBackgroundColor(mLastBackgroundColor);
   }
 }
 void
 TabChild::GetDPI(float* aDPI)
 {
     *aDPI = -1.0;
     if (!mRemoteFrame) {
         return;
     }
     SendGetDPI(aDPI);
 }
 void
 TabChild::GetDefaultScale(double* aScale)
 {
     *aScale = -1.0;
     if (!mRemoteFrame) {
         return;
     }
     SendGetDefaultScale(aScale);
 }
 void
 TabChild::NotifyPainted()
 {
     if (UseDirectCompositor() && !mNotified) {
         mRemoteFrame->SendNotifyCompositorTransaction();
         mNotified = true;
     }
 }
 bool
 TabChild::DispatchMouseEvent(const nsString&       aType,
                              const CSSPoint&       aPoint,
                              const int32_t&        aButton,
                              const int32_t&        aClickCount,
                              const int32_t&        aModifiers,
                              const bool&           aIgnoreRootScrollFrame,
                              const unsigned short& aInputSourceArg)
 {
   nsCOMPtr<nsIDOMWindowUtils> utils(GetDOMWindowUtils());
   NS_ENSURE_TRUE(utils, true);
   bool defaultPrevented = false;
   utils->SendMouseEvent(aType, aPoint.x, aPoint.y, aButton, aClickCount, aModifiers,
                         aIgnoreRootScrollFrame, 0, aInputSourceArg, false, 4, &defaultPrevented);
   return defaultPrevented;
 }
 void
 TabChild::MakeVisible()
 {
     if (mWidget) {
         mWidget->Show(true);
     }
 }
 void
 TabChild::MakeHidden()
 {
     if (mWidget) {
         mWidget->Show(false);
     }
 }
 void
 TabChild::UpdateHitRegion(const nsRegion& aRegion)
 {
     mRemoteFrame->SendUpdateHitRegion(aRegion);
 }
 NS_IMETHODIMP
 TabChild::GetMessageManager(nsIContentFrameMessageManager** aResult)
 {
   if (mTabChildGlobal) {
     NS_ADDREF(*aResult = mTabChildGlobal);
     return NS_OK;
   }
   *aResult = nullptr;
   return NS_ERROR_FAILURE;
 }
 void
 TabChild::SendRequestFocus(bool aCanFocus)
 {
   PBrowserChild::SendRequestFocus(aCanFocus);
 }
 PIndexedDBChild*
 TabChild::AllocPIndexedDBChild(
                             const nsCString& aGroup,
                             const nsCString& aASCIIOrigin, bool* /* aAllowed */)
 {
   NS_NOTREACHED("Should never get here!");
   return nullptr;
 }
 bool
 TabChild::DeallocPIndexedDBChild(PIndexedDBChild* aActor)
 {
   delete aActor;
   return true;
 }
 bool
 TabChild::DoSendBlockingMessage(JSContext* aCx,
                                 const nsAString& aMessage,
                                 const StructuredCloneData& aData,
                                 JS::Handle<JSObject *> aCpows,
                                 nsIPrincipal* aPrincipal,
                                 InfallibleTArray<nsString>* aJSONRetVal,
                                 bool aIsSync)
 {
   ContentChild* cc = Manager();
   ClonedMessageData data;
   if (!BuildClonedMessageDataForChild(cc, aData, data)) {
     return false;
   }
   InfallibleTArray<CpowEntry> cpows;
   if (sCpowsEnabled) {
     if (!cc->GetCPOWManager()->Wrap(aCx, aCpows, &cpows)) {
       return false;
     }
   }
   if (aIsSync) {
     return SendSyncMessage(PromiseFlatString(aMessage), data, cpows,
                            aPrincipal, aJSONRetVal);
   }
   return CallRpcMessage(PromiseFlatString(aMessage), data, cpows,
                         aPrincipal, aJSONRetVal);
 }
 bool
 TabChild::DoSendAsyncMessage(JSContext* aCx,
                              const nsAString& aMessage,
                              const StructuredCloneData& aData,
                              JS::Handle<JSObject *> aCpows,
                              nsIPrincipal* aPrincipal)
 {
   ContentChild* cc = Manager();
   ClonedMessageData data;
   if (!BuildClonedMessageDataForChild(cc, aData, data)) {
     return false;
   }
   InfallibleTArray<CpowEntry> cpows;
   if (sCpowsEnabled) {
     if (!cc->GetCPOWManager()->Wrap(aCx, aCpows, &cpows)) {
       return false;
     }
   }
   return SendAsyncMessage(PromiseFlatString(aMessage), data, cpows,
                           aPrincipal);
 }
 TabChild*
 TabChild::GetFrom(nsIPresShell* aPresShell)
 {
   nsIDocument* doc = aPresShell->GetDocument();
   if (!doc) {
       return nullptr;
   }
   nsCOMPtr<nsIDocShell> docShell(doc->GetDocShell());
   return GetFrom(docShell);
 }
 TabChild*
 TabChild::GetFrom(uint64_t aLayersId)
 {
   if (!sTabChildren) {
     return nullptr;
   }
   return sTabChildren->Get(aLayersId);
 }
 void
 TabChild::DidComposite()
 {
   MOZ_ASSERT(mWidget);
   MOZ_ASSERT(mWidget->GetLayerManager());
   MOZ_ASSERT(mWidget->GetLayerManager()->GetBackendType() == LayersBackend::LAYERS_CLIENT);
   ClientLayerManager *manager = static_cast<ClientLayerManager*>(mWidget->GetLayerManager());
   manager->DidComposite();
 }
 NS_IMETHODIMP
 TabChild::OnShowTooltip(int32_t aXCoords, int32_t aYCoords, const char16_t *aTipText)
 {
     nsString str(aTipText);
     SendShowTooltip(aXCoords, aYCoords, str);
     return NS_OK;
 }
 NS_IMETHODIMP
 TabChild::OnHideTooltip()
 {
     SendHideTooltip();
     return NS_OK;
 }
 TabChildGlobal::TabChildGlobal(TabChildBase* aTabChild)
 : mTabChild(aTabChild)
 {
 }
 void
 TabChildGlobal::Init()
 {
   NS_ASSERTION(!mMessageManager, "Re-initializing?!?");
   mMessageManager = new nsFrameMessageManager(mTabChild,
                                               nullptr,
                                               MM_CHILD);
 }
 NS_IMPL_CYCLE_COLLECTION_INHERITED(TabChildGlobal, DOMEventTargetHelper,
                                    mMessageManager, mTabChild)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TabChildGlobal)
   NS_INTERFACE_MAP_ENTRY(nsIMessageListenerManager)
   NS_INTERFACE_MAP_ENTRY(nsIMessageSender)
   NS_INTERFACE_MAP_ENTRY(nsISyncMessageSender)
   NS_INTERFACE_MAP_ENTRY(nsIContentFrameMessageManager)
   NS_INTERFACE_MAP_ENTRY(nsIScriptObjectPrincipal)
   NS_INTERFACE_MAP_ENTRY(nsIGlobalObject)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ContentFrameMessageManager)
 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
 NS_IMPL_ADDREF_INHERITED(TabChildGlobal, DOMEventTargetHelper)
 NS_IMPL_RELEASE_INHERITED(TabChildGlobal, DOMEventTargetHelper)
 /* [notxpcom] boolean markForCC (); */
 // This method isn't automatically forwarded safely because it's notxpcom, so
 // the IDL binding doesn't know what value to return.
 NS_IMETHODIMP_(bool)
 TabChildGlobal::MarkForCC()
 {
   return mMessageManager ? mMessageManager->MarkForCC() : false;
 }
 NS_IMETHODIMP
 TabChildGlobal::GetContent(nsIDOMWindow** aContent)
 {
   *aContent = nullptr;
   if (!mTabChild)
     return NS_ERROR_NULL_POINTER;
   nsCOMPtr<nsIDOMWindow> window = do_GetInterface(mTabChild->WebNavigation());
   window.swap(*aContent);
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChildGlobal::PrivateNoteIntentionalCrash()
 {
     mozilla::NoteIntentionalCrash("tab");
     return NS_OK;
 }
 NS_IMETHODIMP
 TabChildGlobal::GetDocShell(nsIDocShell** aDocShell)
 {
   *aDocShell = nullptr;
   if (!mTabChild)
     return NS_ERROR_NULL_POINTER;
   nsCOMPtr<nsIDocShell> docShell = do_GetInterface(mTabChild->WebNavigation());
   docShell.swap(*aDocShell);
   return NS_OK;
 }
 NS_IMETHODIMP
 TabChildGlobal::Btoa(const nsAString& aBinaryData,
                      nsAString& aAsciiBase64String)
 {
   return nsContentUtils::Btoa(aBinaryData, aAsciiBase64String);
 }
 NS_IMETHODIMP
 TabChildGlobal::Atob(const nsAString& aAsciiString,
                      nsAString& aBinaryData)
 {
   return nsContentUtils::Atob(aAsciiString, aBinaryData);
 }
 JSContext*
 TabChildGlobal::GetJSContextForEventHandlers()
 {
   return nsContentUtils::GetSafeJSContext();
 }
 nsIPrincipal*
 TabChildGlobal::GetPrincipal()
 {
   if (!mTabChild)
     return nullptr;
   return mTabChild->GetPrincipal();
 }
 JSObject*
 TabChildGlobal::GetGlobalJSObject()
 {
   NS_ENSURE_TRUE(mTabChild, nullptr);
   nsCOMPtr<nsIXPConnectJSObjectHolder> ref = mTabChild->GetGlobal();
   NS_ENSURE_TRUE(ref, nullptr);
   return ref->GetJSObject();
 }

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dom/ipc/TabChild.cpp@7e26c7da4463 (annotated)

dom/ipc/TabChild.cpp