The Tor Browser: content/base/src/nsFrameLoader.cpp@6474c204b198 (annotated)

content/base/src/nsFrameLoader.cpp@6474c204b198 (annotated)

content/base/src/nsFrameLoader.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 sw=2 et tw=78: */
 /* 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/. */
 /*
  * Class for managing loading of a subframe (creation of the docshell,
  * handling of loads in it, recursion-checking).
  */
 #include "base/basictypes.h"
 #include "prenv.h"
 #include "mozIApplication.h"
 #include "nsIDOMHTMLIFrameElement.h"
 #include "nsIDOMHTMLFrameElement.h"
 #include "nsIDOMMozBrowserFrame.h"
 #include "nsIDOMWindow.h"
 #include "nsIPresShell.h"
 #include "nsIContentInlines.h"
 #include "nsIContentViewer.h"
 #include "nsIDocument.h"
 #include "nsIDOMDocument.h"
 #include "nsIDOMFile.h"
 #include "nsPIDOMWindow.h"
 #include "nsIWebNavigation.h"
 #include "nsIWebProgress.h"
 #include "nsIDocShell.h"
 #include "nsIDocShellTreeOwner.h"
 #include "nsIDocShellLoadInfo.h"
 #include "nsIDOMApplicationRegistry.h"
 #include "nsIBaseWindow.h"
 #include "nsContentUtils.h"
 #include "nsCxPusher.h"
 #include "nsIXPConnect.h"
 #include "nsUnicharUtils.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIScrollable.h"
 #include "nsFrameLoader.h"
 #include "nsIDOMEventTarget.h"
 #include "nsIFrame.h"
 #include "nsIScrollableFrame.h"
 #include "nsSubDocumentFrame.h"
 #include "nsError.h"
 #include "nsISHistory.h"
 #include "nsISHistoryInternal.h"
 #include "nsIDOMHTMLDocument.h"
 #include "nsIXULWindow.h"
 #include "nsIEditor.h"
 #include "nsIMozBrowserFrame.h"
 #include "nsIPermissionManager.h"
 #include "nsISHistory.h"
 #include "nsNullPrincipal.h"
 #include "nsLayoutUtils.h"
 #include "nsView.h"
 #include "nsIURI.h"
 #include "nsIURL.h"
 #include "nsNetUtil.h"
 #include "nsGkAtoms.h"
 #include "nsNameSpaceManager.h"
 #include "nsThreadUtils.h"
 #include "nsIDOMChromeWindow.h"
 #include "nsInProcessTabChildGlobal.h"
 #include "Layers.h"
 #include "AppProcessChecker.h"
 #include "ContentParent.h"
 #include "TabParent.h"
 #include "mozilla/AsyncEventDispatcher.h"
 #include "mozilla/GuardObjects.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/unused.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/layout/RenderFrameParent.h"
 #include "nsIAppsService.h"
 #include "GeckoProfiler.h"
 #include "jsapi.h"
 #include "mozilla/dom/HTMLIFrameElement.h"
 #include "nsSandboxFlags.h"
 #include "JavaScriptParent.h"
 #include "mozilla/dom/StructuredCloneUtils.h"
 #ifdef MOZ_XUL
 #include "nsXULPopupManager.h"
 #endif
 using namespace mozilla;
 using namespace mozilla::hal;
 using namespace mozilla::dom;
 using namespace mozilla::dom::ipc;
 using namespace mozilla::layers;
 using namespace mozilla::layout;
 typedef FrameMetrics::ViewID ViewID;
 class nsAsyncDocShellDestroyer : public nsRunnable
 {
 public:
   nsAsyncDocShellDestroyer(nsIDocShell* aDocShell)
     : mDocShell(aDocShell)
   {
   }
   NS_IMETHOD Run()
   {
     nsCOMPtr<nsIBaseWindow> base_win(do_QueryInterface(mDocShell));
     if (base_win) {
       base_win->Destroy();
     }
     return NS_OK;
   }
   nsRefPtr<nsIDocShell> mDocShell;
 };
 NS_IMPL_ISUPPORTS(nsContentView, nsIContentView)
 nsresult
 nsContentView::Update(const ViewConfig& aConfig)
 {
   if (aConfig == mConfig) {
     return NS_OK;
   }
   mConfig = aConfig;
   // View changed.  Try to locate our subdoc frame and invalidate
   // it if found.
   if (!mFrameLoader) {
     if (IsRoot()) {
       // Oops, don't have a frame right now.  That's OK; the view
       // config persists and will apply to the next frame we get, if we
       // ever get one.
       return NS_OK;
     } else {
       // This view is no longer valid.
       return NS_ERROR_NOT_AVAILABLE;
     }
   }
   if (RenderFrameParent* rfp = mFrameLoader->GetCurrentRemoteFrame()) {
     rfp->ContentViewScaleChanged(this);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::ScrollTo(float aXpx, float aYpx)
 {
   ViewConfig config(mConfig);
   config.mScrollOffset = nsPoint(nsPresContext::CSSPixelsToAppUnits(aXpx),
                                  nsPresContext::CSSPixelsToAppUnits(aYpx));
   return Update(config);
 }
 NS_IMETHODIMP
 nsContentView::ScrollBy(float aDXpx, float aDYpx)
 {
   ViewConfig config(mConfig);
   config.mScrollOffset.MoveBy(nsPresContext::CSSPixelsToAppUnits(aDXpx),
                               nsPresContext::CSSPixelsToAppUnits(aDYpx));
   return Update(config);
 }
 NS_IMETHODIMP
 nsContentView::SetScale(float aXScale, float aYScale)
 {
   ViewConfig config(mConfig);
   config.mXScale = aXScale;
   config.mYScale = aYScale;
   return Update(config);
 }
 NS_IMETHODIMP
 nsContentView::GetScrollX(float* aViewScrollX)
 {
   *aViewScrollX = nsPresContext::AppUnitsToFloatCSSPixels(
     mConfig.mScrollOffset.x);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetScrollY(float* aViewScrollY)
 {
   *aViewScrollY = nsPresContext::AppUnitsToFloatCSSPixels(
     mConfig.mScrollOffset.y);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetViewportWidth(float* aWidth)
 {
   *aWidth = nsPresContext::AppUnitsToFloatCSSPixels(mViewportSize.width);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetViewportHeight(float* aHeight)
 {
   *aHeight = nsPresContext::AppUnitsToFloatCSSPixels(mViewportSize.height);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetContentWidth(float* aWidth)
 {
   *aWidth = nsPresContext::AppUnitsToFloatCSSPixels(mContentSize.width);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetContentHeight(float* aHeight)
 {
   *aHeight = nsPresContext::AppUnitsToFloatCSSPixels(mContentSize.height);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsContentView::GetId(nsContentViewId* aId)
 {
   NS_ASSERTION(sizeof(nsContentViewId) == sizeof(ViewID),
                "ID size for XPCOM ID and internal ID type are not the same!");
   *aId = mScrollId;
   return NS_OK;
 }
 // Bug 136580: Limit to the number of nested content frames that can have the
 //             same URL. This is to stop content that is recursively loading
 //             itself.  Note that "#foo" on the end of URL doesn't affect
 //             whether it's considered identical, but "?foo" or ";foo" are
 //             considered and compared.
 // Bug 228829: Limit this to 1, like IE does.
 #define MAX_SAME_URL_CONTENT_FRAMES 1
 // Bug 8065: Limit content frame depth to some reasonable level. This
 // does not count chrome frames when determining depth, nor does it
 // prevent chrome recursion.  Number is fairly arbitrary, but meant to
 // keep number of shells to a reasonable number on accidental recursion with a
 // small (but not 1) branching factor.  With large branching factors the number
 // of shells can rapidly become huge and run us out of memory.  To solve that,
 // we'd need to re-institute a fixed version of bug 98158.
 #define MAX_DEPTH_CONTENT_FRAMES 10
 NS_IMPL_CYCLE_COLLECTION(nsFrameLoader, mDocShell, mMessageManager, mChildMessageManager)
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFrameLoader)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFrameLoader)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFrameLoader)
   NS_INTERFACE_MAP_ENTRY(nsIFrameLoader)
   NS_INTERFACE_MAP_ENTRY(nsIContentViewManager)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIFrameLoader)
 NS_INTERFACE_MAP_END
 nsFrameLoader::nsFrameLoader(Element* aOwner, bool aNetworkCreated)
   : mOwnerContent(aOwner)
   , mAppIdSentToPermissionManager(nsIScriptSecurityManager::NO_APP_ID)
   , mDetachedSubdocViews(nullptr)
   , mDepthTooGreat(false)
   , mIsTopLevelContent(false)
   , mDestroyCalled(false)
   , mNeedsAsyncDestroy(false)
   , mInSwap(false)
   , mInShow(false)
   , mHideCalled(false)
   , mNetworkCreated(aNetworkCreated)
   , mRemoteBrowserShown(false)
   , mRemoteFrame(false)
   , mClipSubdocument(true)
   , mClampScrollPosition(true)
   , mRemoteBrowserInitialized(false)
   , mObservingOwnerContent(false)
   , mVisible(true)
   , mCurrentRemoteFrame(nullptr)
   , mRemoteBrowser(nullptr)
   , mChildID(0)
   , mRenderMode(RENDER_MODE_DEFAULT)
   , mEventMode(EVENT_MODE_NORMAL_DISPATCH)
   , mPendingFrameSent(false)
 {
   ResetPermissionManagerStatus();
 }
 nsFrameLoader::~nsFrameLoader()
 {
   mNeedsAsyncDestroy = true;
   if (mMessageManager) {
     mMessageManager->Disconnect();
   }
   nsFrameLoader::Destroy();
 }
 nsFrameLoader*
 nsFrameLoader::Create(Element* aOwner, bool aNetworkCreated)
 {
   NS_ENSURE_TRUE(aOwner, nullptr);
   nsIDocument* doc = aOwner->OwnerDoc();
   NS_ENSURE_TRUE(!doc->IsResourceDoc() &&
                  ((!doc->IsLoadedAsData() && aOwner->GetCurrentDoc()) ||
                    doc->IsStaticDocument()),
                  nullptr);
   return new nsFrameLoader(aOwner, aNetworkCreated);
 }
 NS_IMETHODIMP
 nsFrameLoader::LoadFrame()
 {
   NS_ENSURE_TRUE(mOwnerContent, NS_ERROR_NOT_INITIALIZED);
   nsAutoString src;
   bool isSrcdoc = mOwnerContent->IsHTML(nsGkAtoms::iframe) &&
                   mOwnerContent->HasAttr(kNameSpaceID_None, nsGkAtoms::srcdoc);
   if (isSrcdoc) {
     src.AssignLiteral("about:srcdoc");
   }
   else {
     GetURL(src);
     src.Trim(" \t\n\r");
     if (src.IsEmpty()) {
       // If the frame is a XUL element and has the attribute 'nodefaultsrc=true'
       // then we will not use 'about:blank' as fallback but return early without
       // starting a load if no 'src' attribute is given (or it's empty).
       if (mOwnerContent->IsXUL() &&
           mOwnerContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::nodefaultsrc,
                                      nsGkAtoms::_true, eCaseMatters)) {
         return NS_OK;
       }
       src.AssignLiteral("about:blank");
     }
   }
   nsIDocument* doc = mOwnerContent->OwnerDoc();
   if (doc->IsStaticDocument()) {
     return NS_OK;
   }
   nsCOMPtr<nsIURI> base_uri = mOwnerContent->GetBaseURI();
   const nsAFlatCString &doc_charset = doc->GetDocumentCharacterSet();
   const char *charset = doc_charset.IsEmpty() ? nullptr : doc_charset.get();
   nsCOMPtr<nsIURI> uri;
   nsresult rv = NS_NewURI(getter_AddRefs(uri), src, charset, base_uri);
   // If the URI was malformed, try to recover by loading about:blank.
   if (rv == NS_ERROR_MALFORMED_URI) {
     rv = NS_NewURI(getter_AddRefs(uri), NS_LITERAL_STRING("about:blank"),
                    charset, base_uri);
   }
   if (NS_SUCCEEDED(rv)) {
     rv = LoadURI(uri);
   }
   if (NS_FAILED(rv)) {
     FireErrorEvent();
     return rv;
   }
   return NS_OK;
 }
 void
 nsFrameLoader::FireErrorEvent()
 {
   if (!mOwnerContent) {
     return;
   }
   nsRefPtr<AsyncEventDispatcher > loadBlockingAsyncDispatcher =
     new LoadBlockingAsyncEventDispatcher(mOwnerContent,
                                          NS_LITERAL_STRING("error"),
                                          false, false);
   loadBlockingAsyncDispatcher->PostDOMEvent();
 }
 NS_IMETHODIMP
 nsFrameLoader::LoadURI(nsIURI* aURI)
 {
   if (!aURI)
     return NS_ERROR_INVALID_POINTER;
   NS_ENSURE_STATE(!mDestroyCalled && mOwnerContent);
   nsCOMPtr<nsIDocument> doc = mOwnerContent->OwnerDoc();
   nsresult rv = CheckURILoad(aURI);
   NS_ENSURE_SUCCESS(rv, rv);
   mURIToLoad = aURI;
   rv = doc->InitializeFrameLoader(this);
   if (NS_FAILED(rv)) {
     mURIToLoad = nullptr;
   }
   return rv;
 }
 nsresult
 nsFrameLoader::ReallyStartLoading()
 {
   nsresult rv = ReallyStartLoadingInternal();
   if (NS_FAILED(rv)) {
     FireErrorEvent();
   }
   return rv;
 }
 class DelayedStartLoadingRunnable : public nsRunnable
 {
 public:
   DelayedStartLoadingRunnable(nsFrameLoader* aFrameLoader)
     : mFrameLoader(aFrameLoader)
   {
   }
   NS_IMETHOD Run()
   {
     // Retry the request.
     mFrameLoader->ReallyStartLoading();
     // We delayed nsFrameLoader::ReallyStartLoading() after the child process is
     // ready and might not be able to notify the remote browser in
     // UpdatePositionAndSize() when reflow finished. Retrigger reflow.
     nsIFrame* frame = mFrameLoader->GetPrimaryFrameOfOwningContent();
     if (!frame) {
       return NS_OK;
     }
     frame->InvalidateFrame();
     frame->PresContext()->PresShell()->
       FrameNeedsReflow(frame, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
     return NS_OK;
   }
 private:
   nsRefPtr<nsFrameLoader> mFrameLoader;
 };
 nsresult
 nsFrameLoader::ReallyStartLoadingInternal()
 {
   NS_ENSURE_STATE(mURIToLoad && mOwnerContent && mOwnerContent->IsInDoc());
   PROFILER_LABEL("nsFrameLoader", "ReallyStartLoading");
   nsresult rv = MaybeCreateDocShell();
   if (NS_FAILED(rv)) {
     return rv;
   }
   if (mRemoteFrame) {
     if (!mRemoteBrowser) {
       if (!mPendingFrameSent) {
         nsCOMPtr<nsIObserverService> os = services::GetObserverService();
         if (os && !mRemoteBrowserInitialized) {
           os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
                               "remote-browser-pending", nullptr);
           mPendingFrameSent = true;
         }
       }
       if (Preferences::GetBool("dom.ipc.processPrelaunch.enabled", false) &&
           !ContentParent::PreallocatedProcessReady()) {
         ContentParent::RunAfterPreallocatedProcessReady(
             new DelayedStartLoadingRunnable(this));
         return NS_ERROR_FAILURE;
       }
       TryRemoteBrowser();
       if (!mRemoteBrowser) {
         NS_WARNING("Couldn't create child process for iframe.");
         return NS_ERROR_FAILURE;
       }
     }
     if (mRemoteBrowserShown || ShowRemoteFrame(nsIntSize(0, 0))) {
       // FIXME get error codes from child
       mRemoteBrowser->LoadURL(mURIToLoad);
     } else {
       NS_WARNING("[nsFrameLoader] ReallyStartLoadingInternal tried but couldn't show remote browser.\n");
     }
     return NS_OK;
   }
   NS_ASSERTION(mDocShell,
                "MaybeCreateDocShell succeeded with a null mDocShell");
   // Just to be safe, recheck uri.
   rv = CheckURILoad(mURIToLoad);
   NS_ENSURE_SUCCESS(rv, rv);
   nsCOMPtr<nsIDocShellLoadInfo> loadInfo;
   mDocShell->CreateLoadInfo(getter_AddRefs(loadInfo));
   NS_ENSURE_TRUE(loadInfo, NS_ERROR_FAILURE);
   // If this frame is sandboxed with respect to origin we will set it up with
   // a null principal later in nsDocShell::DoURILoad.
   // We do it there to correctly sandbox content that was loaded into
   // the frame via other methods than the src attribute.
   // We'll use our principal, not that of the document loaded inside us.  This
   // is very important; needed to prevent XSS attacks on documents loaded in
   // subframes!
   loadInfo->SetOwner(mOwnerContent->NodePrincipal());
   nsCOMPtr<nsIURI> referrer;
   nsAutoString srcdoc;
   bool isSrcdoc = mOwnerContent->IsHTML(nsGkAtoms::iframe) &&
                   mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::srcdoc,
                                          srcdoc);
   if (isSrcdoc) {
     nsAutoString referrerStr;
     mOwnerContent->OwnerDoc()->GetReferrer(referrerStr);
     rv = NS_NewURI(getter_AddRefs(referrer), referrerStr);
     loadInfo->SetSrcdocData(srcdoc);
     nsCOMPtr<nsIURI> baseURI = mOwnerContent->GetBaseURI();
     loadInfo->SetBaseURI(baseURI);
   }
   else {
     rv = mOwnerContent->NodePrincipal()->GetURI(getter_AddRefs(referrer));
     NS_ENSURE_SUCCESS(rv, rv);
   }
   // Use referrer as long as it is not an nsNullPrincipalURI.
   // We could add a method such as GetReferrerURI to principals to make this
   // cleaner, but given that we need to start using Source Browsing Context for
   // referrer (see Bug 960639) this may be wasted effort at this stage.
   if (referrer) {
     bool isNullPrincipalScheme;
     rv = referrer->SchemeIs(NS_NULLPRINCIPAL_SCHEME, &isNullPrincipalScheme);
     if (NS_SUCCEEDED(rv) && !isNullPrincipalScheme) {
       loadInfo->SetReferrer(referrer);
     }
   }
   // Default flags:
   int32_t flags = nsIWebNavigation::LOAD_FLAGS_NONE;
   // Flags for browser frame:
   if (OwnerIsBrowserFrame()) {
     flags = nsIWebNavigation::LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
             nsIWebNavigation::LOAD_FLAGS_DISALLOW_INHERIT_OWNER;
   }
   // Kick off the load...
   bool tmpState = mNeedsAsyncDestroy;
   mNeedsAsyncDestroy = true;
   nsCOMPtr<nsIURI> uriToLoad = mURIToLoad;
   rv = mDocShell->LoadURI(uriToLoad, loadInfo, flags, false);
   mNeedsAsyncDestroy = tmpState;
   mURIToLoad = nullptr;
   NS_ENSURE_SUCCESS(rv, rv);
   return NS_OK;
 }
 nsresult
 nsFrameLoader::CheckURILoad(nsIURI* aURI)
 {
   // Check for security.  The fun part is trying to figure out what principals
   // to use.  The way I figure it, if we're doing a LoadFrame() accidentally
   // (eg someone created a frame/iframe node, we're being parsed, XUL iframes
   // are being reframed, etc.) then we definitely want to use the node
   // principal of mOwnerContent for security checks.  If, on the other hand,
   // someone's setting the src on our owner content, or created it via script,
   // or whatever, then they can clearly access it... and we should still use
   // the principal of mOwnerContent.  I don't think that leads to privilege
   // escalation, and it's reasonably guaranteed to not lead to XSS issues
   // (since caller can already access mOwnerContent in this case).  So just use
   // the principal of mOwnerContent no matter what.  If script wants to run
   // things with its own permissions, which differ from those of mOwnerContent
   // (which means the script is privileged in some way) it should set
   // window.location instead.
   nsIScriptSecurityManager *secMan = nsContentUtils::GetSecurityManager();
   // Get our principal
   nsIPrincipal* principal = mOwnerContent->NodePrincipal();
   // Check if we are allowed to load absURL
   nsresult rv =
     secMan->CheckLoadURIWithPrincipal(principal, aURI,
                                       nsIScriptSecurityManager::STANDARD);
   if (NS_FAILED(rv)) {
     return rv; // We're not
   }
   // Bail out if this is an infinite recursion scenario
   rv = MaybeCreateDocShell();
   if (NS_FAILED(rv)) {
     return rv;
   }
   if (mRemoteFrame) {
     return NS_OK;
   }
   return CheckForRecursiveLoad(aURI);
 }
 NS_IMETHODIMP
 nsFrameLoader::GetDocShell(nsIDocShell **aDocShell)
 {
   *aDocShell = nullptr;
   nsresult rv = NS_OK;
   // If we have an owner, make sure we have a docshell and return
   // that. If not, we're most likely in the middle of being torn down,
   // then we just return null.
   if (mOwnerContent) {
     nsresult rv = MaybeCreateDocShell();
     if (NS_FAILED(rv))
       return rv;
     if (mRemoteFrame) {
       NS_WARNING("No docshells for remote frames!");
       return rv;
     }
     NS_ASSERTION(mDocShell,
                  "MaybeCreateDocShell succeeded, but null mDocShell");
   }
   *aDocShell = mDocShell;
   NS_IF_ADDREF(*aDocShell);
   return rv;
 }
 void
 nsFrameLoader::Finalize()
 {
   nsCOMPtr<nsIBaseWindow> base_win(do_QueryInterface(mDocShell));
   if (base_win) {
     base_win->Destroy();
   }
   mDocShell = nullptr;
 }
 static void
 FirePageHideEvent(nsIDocShellTreeItem* aItem,
                   EventTarget* aChromeEventHandler)
 {
   nsCOMPtr<nsIDocument> internalDoc = do_GetInterface(aItem);
   NS_ASSERTION(internalDoc, "What happened here?");
   internalDoc->OnPageHide(true, aChromeEventHandler);
   int32_t childCount = 0;
   aItem->GetChildCount(&childCount);
   nsAutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids;
   kids.AppendElements(childCount);
   for (int32_t i = 0; i < childCount; ++i) {
     aItem->GetChildAt(i, getter_AddRefs(kids[i]));
   }
   for (uint32_t i = 0; i < kids.Length(); ++i) {
     if (kids[i]) {
       FirePageHideEvent(kids[i], aChromeEventHandler);
     }
   }
 }
 // The pageshow event is fired for a given document only if IsShowing() returns
 // the same thing as aFireIfShowing.  This gives us a way to fire pageshow only
 // on documents that are still loading or only on documents that are already
 // loaded.
 static void
 FirePageShowEvent(nsIDocShellTreeItem* aItem,
                   EventTarget* aChromeEventHandler,
                   bool aFireIfShowing)
 {
   int32_t childCount = 0;
   aItem->GetChildCount(&childCount);
   nsAutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids;
   kids.AppendElements(childCount);
   for (int32_t i = 0; i < childCount; ++i) {
     aItem->GetChildAt(i, getter_AddRefs(kids[i]));
   }
   for (uint32_t i = 0; i < kids.Length(); ++i) {
     if (kids[i]) {
       FirePageShowEvent(kids[i], aChromeEventHandler, aFireIfShowing);
     }
   }
   nsCOMPtr<nsIDocument> internalDoc = do_GetInterface(aItem);
   NS_ASSERTION(internalDoc, "What happened here?");
   if (internalDoc->IsShowing() == aFireIfShowing) {
     internalDoc->OnPageShow(true, aChromeEventHandler);
   }
 }
 static void
 SetTreeOwnerAndChromeEventHandlerOnDocshellTree(nsIDocShellTreeItem* aItem,
                                                 nsIDocShellTreeOwner* aOwner,
                                                 EventTarget* aHandler)
 {
   NS_PRECONDITION(aItem, "Must have item");
   aItem->SetTreeOwner(aOwner);
   int32_t childCount = 0;
   aItem->GetChildCount(&childCount);
   for (int32_t i = 0; i < childCount; ++i) {
     nsCOMPtr<nsIDocShellTreeItem> item;
     aItem->GetChildAt(i, getter_AddRefs(item));
     if (aHandler) {
       nsCOMPtr<nsIDocShell> shell(do_QueryInterface(item));
       shell->SetChromeEventHandler(aHandler);
     }
     SetTreeOwnerAndChromeEventHandlerOnDocshellTree(item, aOwner, aHandler);
   }
 }
 /**
  * Set the type of the treeitem and hook it up to the treeowner.
  * @param aItem the treeitem we're working with
  * @param aTreeOwner the relevant treeowner; might be null
  * @param aParentType the nsIDocShellTreeItem::GetType of our parent docshell
  * @param aParentNode if non-null, the docshell we should be added as a child to
  *
  * @return whether aItem is top-level content
  */
 bool
 nsFrameLoader::AddTreeItemToTreeOwner(nsIDocShellTreeItem* aItem,
                                       nsIDocShellTreeOwner* aOwner,
                                       int32_t aParentType,
                                       nsIDocShell* aParentNode)
 {
   NS_PRECONDITION(aItem, "Must have docshell treeitem");
   NS_PRECONDITION(mOwnerContent, "Must have owning content");
   nsAutoString value;
   bool isContent = false;
   mOwnerContent->GetAttr(kNameSpaceID_None, TypeAttrName(), value);
   // we accept "content" and "content-xxx" values.
   // at time of writing, we expect "xxx" to be "primary" or "targetable", but
   // someday it might be an integer expressing priority or something else.
   isContent = value.LowerCaseEqualsLiteral("content") ||
     StringBeginsWith(value, NS_LITERAL_STRING("content-"),
                      nsCaseInsensitiveStringComparator());
   // Force mozbrowser frames to always be typeContent, even if the
   // mozbrowser interfaces are disabled.
   nsCOMPtr<nsIDOMMozBrowserFrame> mozbrowser =
     do_QueryInterface(mOwnerContent);
   if (mozbrowser) {
     bool isMozbrowser = false;
     mozbrowser->GetMozbrowser(&isMozbrowser);
     isContent |= isMozbrowser;
   }
   if (isContent) {
     // The web shell's type is content.
     aItem->SetItemType(nsIDocShellTreeItem::typeContent);
   } else {
     // Inherit our type from our parent docshell.  If it is
     // chrome, we'll be chrome.  If it is content, we'll be
     // content.
     aItem->SetItemType(aParentType);
   }
   // Now that we have our type set, add ourselves to the parent, as needed.
   if (aParentNode) {
     aParentNode->AddChild(aItem);
   }
   bool retval = false;
   if (aParentType == nsIDocShellTreeItem::typeChrome && isContent) {
     retval = true;
     bool is_primary = value.LowerCaseEqualsLiteral("content-primary");
     if (aOwner) {
       bool is_targetable = is_primary ||
         value.LowerCaseEqualsLiteral("content-targetable");
       mOwnerContent->AddMutationObserver(this);
       mObservingOwnerContent = true;
       aOwner->ContentShellAdded(aItem, is_primary, is_targetable, value);
     }
   }
   return retval;
 }
 static bool
 AllDescendantsOfType(nsIDocShellTreeItem* aParentItem, int32_t aType)
 {
   int32_t childCount = 0;
   aParentItem->GetChildCount(&childCount);
   for (int32_t i = 0; i < childCount; ++i) {
     nsCOMPtr<nsIDocShellTreeItem> kid;
     aParentItem->GetChildAt(i, getter_AddRefs(kid));
     if (kid->ItemType() != aType || !AllDescendantsOfType(kid, aType)) {
       return false;
     }
   }
   return true;
 }
 /**
  * A class that automatically sets mInShow to false when it goes
  * out of scope.
  */
 class MOZ_STACK_CLASS AutoResetInShow {
   private:
     nsFrameLoader* mFrameLoader;
     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
   public:
     AutoResetInShow(nsFrameLoader* aFrameLoader MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
       : mFrameLoader(aFrameLoader)
     {
       MOZ_GUARD_OBJECT_NOTIFIER_INIT;
     }
     ~AutoResetInShow() { mFrameLoader->mInShow = false; }
 };
 bool
 nsFrameLoader::Show(int32_t marginWidth, int32_t marginHeight,
                     int32_t scrollbarPrefX, int32_t scrollbarPrefY,
                     nsSubDocumentFrame* frame)
 {
   if (mInShow) {
     return false;
   }
   // Reset mInShow if we exit early.
   AutoResetInShow resetInShow(this);
   mInShow = true;
   nsresult rv = MaybeCreateDocShell();
   if (NS_FAILED(rv)) {
     return false;
   }
   if (!mRemoteFrame) {
     if (!mDocShell)
       return false;
     mDocShell->SetMarginWidth(marginWidth);
     mDocShell->SetMarginHeight(marginHeight);
     nsCOMPtr<nsIScrollable> sc = do_QueryInterface(mDocShell);
     if (sc) {
       sc->SetDefaultScrollbarPreferences(nsIScrollable::ScrollOrientation_X,
                                          scrollbarPrefX);
       sc->SetDefaultScrollbarPreferences(nsIScrollable::ScrollOrientation_Y,
                                          scrollbarPrefY);
     }
     nsCOMPtr<nsIPresShell> presShell = mDocShell->GetPresShell();
     if (presShell) {
       // Ensure root scroll frame is reflowed in case scroll preferences or
       // margins have changed
       nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
       if (rootScrollFrame) {
         presShell->FrameNeedsReflow(rootScrollFrame, nsIPresShell::eResize,
                                     NS_FRAME_IS_DIRTY);
       }
       return true;
     }
   }
   nsIntSize size = frame->GetSubdocumentSize();
   if (mRemoteFrame) {
     return ShowRemoteFrame(size, frame);
   }
   nsView* view = frame->EnsureInnerView();
   if (!view)
     return false;
   nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(mDocShell);
   NS_ASSERTION(baseWindow, "Found a nsIDocShell that isn't a nsIBaseWindow.");
   baseWindow->InitWindow(nullptr, view->GetWidget(), 0, 0,
                          size.width, size.height);
   // This is kinda whacky, this "Create()" call doesn't really
   // create anything, one starts to wonder why this was named
   // "Create"...
   baseWindow->Create();
   baseWindow->SetVisibility(true);
   NS_ENSURE_TRUE(mDocShell, false);
   // Trigger editor re-initialization if midas is turned on in the
   // sub-document. This shouldn't be necessary, but given the way our
   // editor works, it is. See
   // https://bugzilla.mozilla.org/show_bug.cgi?id=284245
   nsCOMPtr<nsIPresShell> presShell = mDocShell->GetPresShell();
   if (presShell) {
     nsCOMPtr<nsIDOMHTMLDocument> doc =
       do_QueryInterface(presShell->GetDocument());
     if (doc) {
       nsAutoString designMode;
       doc->GetDesignMode(designMode);
       if (designMode.EqualsLiteral("on")) {
         // Hold on to the editor object to let the document reattach to the
         // same editor object, instead of creating a new one.
         nsCOMPtr<nsIEditor> editor;
         nsresult rv = mDocShell->GetEditor(getter_AddRefs(editor));
         NS_ENSURE_SUCCESS(rv, false);
         doc->SetDesignMode(NS_LITERAL_STRING("off"));
         doc->SetDesignMode(NS_LITERAL_STRING("on"));
       } else {
         // Re-initialize the presentation for contenteditable documents
         bool editable = false,
              hasEditingSession = false;
         mDocShell->GetEditable(&editable);
         mDocShell->GetHasEditingSession(&hasEditingSession);
         nsCOMPtr<nsIEditor> editor;
         mDocShell->GetEditor(getter_AddRefs(editor));
         if (editable && hasEditingSession && editor) {
           editor->PostCreate();
         }
       }
     }
   }
   mInShow = false;
   if (mHideCalled) {
     mHideCalled = false;
     Hide();
     return false;
   }
   return true;
 }
 void
 nsFrameLoader::MarginsChanged(uint32_t aMarginWidth,
                               uint32_t aMarginHeight)
 {
   // We assume that the margins are always zero for remote frames.
   if (mRemoteFrame)
     return;
   // If there's no docshell, we're probably not up and running yet.
   // nsFrameLoader::Show() will take care of setting the right
   // margins.
   if (!mDocShell)
     return;
   // Set the margins
   mDocShell->SetMarginWidth(aMarginWidth);
   mDocShell->SetMarginHeight(aMarginHeight);
   // Trigger a restyle if there's a prescontext
   nsRefPtr<nsPresContext> presContext;
   mDocShell->GetPresContext(getter_AddRefs(presContext));
   if (presContext)
     presContext->RebuildAllStyleData(nsChangeHint(0));
 }
 bool
 nsFrameLoader::ShowRemoteFrame(const nsIntSize& size,
                                nsSubDocumentFrame *aFrame)
 {
   NS_ASSERTION(mRemoteFrame, "ShowRemote only makes sense on remote frames.");
   if (!mRemoteBrowser) {
     TryRemoteBrowser();
     if (!mRemoteBrowser) {
       NS_ERROR("Couldn't create child process.");
       return false;
     }
   }
   // FIXME/bug 589337: Show()/Hide() is pretty expensive for
   // cross-process layers; need to figure out what behavior we really
   // want here.  For now, hack.
   if (!mRemoteBrowserShown) {
     if (!mOwnerContent ||
         !mOwnerContent->GetCurrentDoc()) {
       return false;
     }
     nsRefPtr<layers::LayerManager> layerManager =
       nsContentUtils::LayerManagerForDocument(mOwnerContent->GetCurrentDoc());
     if (!layerManager) {
       // This is just not going to work.
       return false;
     }
     mRemoteBrowser->Show(size);
     mRemoteBrowserShown = true;
     EnsureMessageManager();
     nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     if (os && !mRemoteBrowserInitialized) {
       if (!mPendingFrameSent) {
         os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
                             "remote-browser-pending", nullptr);
         mPendingFrameSent = true;
       }
       os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
                           "remote-browser-shown", nullptr);
       mRemoteBrowserInitialized = true;
     }
   } else {
     nsRect dimensions;
     NS_ENSURE_SUCCESS(GetWindowDimensions(dimensions), false);
     // Don't show remote iframe if we are waiting for the completion of reflow.
     if (!aFrame || !(aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
       mRemoteBrowser->UpdateDimensions(dimensions, size);
     }
   }
   return true;
 }
 void
 nsFrameLoader::Hide()
 {
   if (mHideCalled) {
     return;
   }
   if (mInShow) {
     mHideCalled = true;
     return;
   }
   if (!mDocShell)
     return;
   nsCOMPtr<nsIContentViewer> contentViewer;
   mDocShell->GetContentViewer(getter_AddRefs(contentViewer));
   if (contentViewer)
     contentViewer->SetSticky(false);
   nsCOMPtr<nsIBaseWindow> baseWin = do_QueryInterface(mDocShell);
   NS_ASSERTION(baseWin,
                "Found an nsIDocShell which doesn't implement nsIBaseWindow.");
   baseWin->SetVisibility(false);
   baseWin->SetParentWidget(nullptr);
 }
 nsresult
 nsFrameLoader::SwapWithOtherLoader(nsFrameLoader* aOther,
                                    nsRefPtr<nsFrameLoader>& aFirstToSwap,
                                    nsRefPtr<nsFrameLoader>& aSecondToSwap)
 {
   NS_PRECONDITION((aFirstToSwap == this && aSecondToSwap == aOther) ||
                   (aFirstToSwap == aOther && aSecondToSwap == this),
                   "Swapping some sort of random loaders?");
   NS_ENSURE_STATE(!mInShow && !aOther->mInShow);
   Element* ourContent = mOwnerContent;
   Element* otherContent = aOther->mOwnerContent;
   if (!ourContent || !otherContent) {
     // Can't handle this
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // Make sure there are no same-origin issues
   bool equal;
   nsresult rv =
     ourContent->NodePrincipal()->Equals(otherContent->NodePrincipal(), &equal);
   if (NS_FAILED(rv) || !equal) {
     // Security problems loom.  Just bail on it all
     return NS_ERROR_DOM_SECURITY_ERR;
   }
   nsCOMPtr<nsIDocShell> ourDocshell = GetExistingDocShell();
   nsCOMPtr<nsIDocShell> otherDocshell = aOther->GetExistingDocShell();
   if (!ourDocshell || !otherDocshell) {
     // How odd
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // To avoid having to mess with session history, avoid swapping
   // frameloaders that don't correspond to root same-type docshells,
   // unless both roots have session history disabled.
   nsCOMPtr<nsIDocShellTreeItem> ourRootTreeItem, otherRootTreeItem;
   ourDocshell->GetSameTypeRootTreeItem(getter_AddRefs(ourRootTreeItem));
   otherDocshell->GetSameTypeRootTreeItem(getter_AddRefs(otherRootTreeItem));
   nsCOMPtr<nsIWebNavigation> ourRootWebnav =
     do_QueryInterface(ourRootTreeItem);
   nsCOMPtr<nsIWebNavigation> otherRootWebnav =
     do_QueryInterface(otherRootTreeItem);
   if (!ourRootWebnav || !otherRootWebnav) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   nsCOMPtr<nsISHistory> ourHistory;
   nsCOMPtr<nsISHistory> otherHistory;
   ourRootWebnav->GetSessionHistory(getter_AddRefs(ourHistory));
   otherRootWebnav->GetSessionHistory(getter_AddRefs(otherHistory));
   if ((ourRootTreeItem != ourDocshell || otherRootTreeItem != otherDocshell) &&
       (ourHistory || otherHistory)) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // Also make sure that the two docshells are the same type. Otherwise
   // swapping is certainly not safe. If this needs to be changed then
   // the code below needs to be audited as it assumes identical types.
   int32_t ourType = ourDocshell->ItemType();
   int32_t otherType = otherDocshell->ItemType();
   if (ourType != otherType) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // One more twist here.  Setting up the right treeowners in a heterogeneous
   // tree is a bit of a pain.  So make sure that if ourType is not
   // nsIDocShellTreeItem::typeContent then all of our descendants are the same
   // type as us.
   if (ourType != nsIDocShellTreeItem::typeContent &&
       (!AllDescendantsOfType(ourDocshell, ourType) ||
        !AllDescendantsOfType(otherDocshell, otherType))) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // Save off the tree owners, frame elements, chrome event handlers, and
   // docshell and document parents before doing anything else.
   nsCOMPtr<nsIDocShellTreeOwner> ourOwner, otherOwner;
   ourDocshell->GetTreeOwner(getter_AddRefs(ourOwner));
   otherDocshell->GetTreeOwner(getter_AddRefs(otherOwner));
   // Note: it's OK to have null treeowners.
   nsCOMPtr<nsIDocShellTreeItem> ourParentItem, otherParentItem;
   ourDocshell->GetParent(getter_AddRefs(ourParentItem));
   otherDocshell->GetParent(getter_AddRefs(otherParentItem));
   if (!ourParentItem || !otherParentItem) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // Make sure our parents are the same type too
   int32_t ourParentType = ourParentItem->ItemType();
   int32_t otherParentType = otherParentItem->ItemType();
   if (ourParentType != otherParentType) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   nsCOMPtr<nsPIDOMWindow> ourWindow = do_GetInterface(ourDocshell);
   nsCOMPtr<nsPIDOMWindow> otherWindow = do_GetInterface(otherDocshell);
   nsCOMPtr<Element> ourFrameElement =
     ourWindow->GetFrameElementInternal();
   nsCOMPtr<Element> otherFrameElement =
     otherWindow->GetFrameElementInternal();
   nsCOMPtr<EventTarget> ourChromeEventHandler =
     do_QueryInterface(ourWindow->GetChromeEventHandler());
   nsCOMPtr<EventTarget> otherChromeEventHandler =
     do_QueryInterface(otherWindow->GetChromeEventHandler());
   NS_ASSERTION(SameCOMIdentity(ourFrameElement, ourContent) &&
                SameCOMIdentity(otherFrameElement, otherContent) &&
                SameCOMIdentity(ourChromeEventHandler, ourContent) &&
                SameCOMIdentity(otherChromeEventHandler, otherContent),
                "How did that happen, exactly?");
   nsCOMPtr<nsIDocument> ourChildDocument = ourWindow->GetExtantDoc();
   nsCOMPtr<nsIDocument> otherChildDocument = otherWindow ->GetExtantDoc();
   if (!ourChildDocument || !otherChildDocument) {
     // This shouldn't be happening
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   nsCOMPtr<nsIDocument> ourParentDocument =
     ourChildDocument->GetParentDocument();
   nsCOMPtr<nsIDocument> otherParentDocument =
     otherChildDocument->GetParentDocument();
   // Make sure to swap docshells between the two frames.
   nsIDocument* ourDoc = ourContent->GetCurrentDoc();
   nsIDocument* otherDoc = otherContent->GetCurrentDoc();
   if (!ourDoc || !otherDoc) {
     // Again, how odd, given that we had docshells
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   NS_ASSERTION(ourDoc == ourParentDocument, "Unexpected parent document");
   NS_ASSERTION(otherDoc == otherParentDocument, "Unexpected parent document");
   nsIPresShell* ourShell = ourDoc->GetShell();
   nsIPresShell* otherShell = otherDoc->GetShell();
   if (!ourShell || !otherShell) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   if (ourDocshell->GetIsBrowserElement() !=
       otherDocshell->GetIsBrowserElement() ||
       ourDocshell->GetIsApp() != otherDocshell->GetIsApp()) {
       return NS_ERROR_NOT_IMPLEMENTED;
   }
   if (mInSwap || aOther->mInSwap) {
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   mInSwap = aOther->mInSwap = true;
   // Fire pageshow events on still-loading pages, and then fire pagehide
   // events.  Note that we do NOT fire these in the normal way, but just fire
   // them on the chrome event handlers.
   FirePageShowEvent(ourDocshell, ourChromeEventHandler, false);
   FirePageShowEvent(otherDocshell, otherChromeEventHandler, false);
   FirePageHideEvent(ourDocshell, ourChromeEventHandler);
   FirePageHideEvent(otherDocshell, otherChromeEventHandler);
   nsIFrame* ourFrame = ourContent->GetPrimaryFrame();
   nsIFrame* otherFrame = otherContent->GetPrimaryFrame();
   if (!ourFrame || !otherFrame) {
     mInSwap = aOther->mInSwap = false;
     FirePageShowEvent(ourDocshell, ourChromeEventHandler, true);
     FirePageShowEvent(otherDocshell, otherChromeEventHandler, true);
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   nsSubDocumentFrame* ourFrameFrame = do_QueryFrame(ourFrame);
   if (!ourFrameFrame) {
     mInSwap = aOther->mInSwap = false;
     FirePageShowEvent(ourDocshell, ourChromeEventHandler, true);
     FirePageShowEvent(otherDocshell, otherChromeEventHandler, true);
     return NS_ERROR_NOT_IMPLEMENTED;
   }
   // OK.  First begin to swap the docshells in the two nsIFrames
   rv = ourFrameFrame->BeginSwapDocShells(otherFrame);
   if (NS_FAILED(rv)) {
     mInSwap = aOther->mInSwap = false;
     FirePageShowEvent(ourDocshell, ourChromeEventHandler, true);
     FirePageShowEvent(otherDocshell, otherChromeEventHandler, true);
     return rv;
   }
   // Now move the docshells to the right docshell trees.  Note that this
   // resets their treeowners to null.
   ourParentItem->RemoveChild(ourDocshell);
   otherParentItem->RemoveChild(otherDocshell);
   if (ourType == nsIDocShellTreeItem::typeContent) {
     ourOwner->ContentShellRemoved(ourDocshell);
     otherOwner->ContentShellRemoved(otherDocshell);
   }
   ourParentItem->AddChild(otherDocshell);
   otherParentItem->AddChild(ourDocshell);
   // Restore the correct chrome event handlers.
   ourDocshell->SetChromeEventHandler(otherChromeEventHandler);
   otherDocshell->SetChromeEventHandler(ourChromeEventHandler);
   // Restore the correct treeowners
   // (and also chrome event handlers for content frames only).
   SetTreeOwnerAndChromeEventHandlerOnDocshellTree(ourDocshell, otherOwner,
     ourType == nsIDocShellTreeItem::typeContent ? otherChromeEventHandler : nullptr);
   SetTreeOwnerAndChromeEventHandlerOnDocshellTree(otherDocshell, ourOwner,
     ourType == nsIDocShellTreeItem::typeContent ? ourChromeEventHandler : nullptr);
   // Switch the owner content before we start calling AddTreeItemToTreeOwner.
   // Note that we rely on this to deal with setting mObservingOwnerContent to
   // false and calling RemoveMutationObserver as needed.
   SetOwnerContent(otherContent);
   aOther->SetOwnerContent(ourContent);
   AddTreeItemToTreeOwner(ourDocshell, otherOwner, otherParentType, nullptr);
   aOther->AddTreeItemToTreeOwner(otherDocshell, ourOwner, ourParentType,
                                  nullptr);
   // SetSubDocumentFor nulls out parent documents on the old child doc if a
   // new non-null document is passed in, so just go ahead and remove both
   // kids before reinserting in the parent subdoc maps, to avoid
   // complications.
   ourParentDocument->SetSubDocumentFor(ourContent, nullptr);
   otherParentDocument->SetSubDocumentFor(otherContent, nullptr);
   ourParentDocument->SetSubDocumentFor(ourContent, otherChildDocument);
   otherParentDocument->SetSubDocumentFor(otherContent, ourChildDocument);
   ourWindow->SetFrameElementInternal(otherFrameElement);
   otherWindow->SetFrameElementInternal(ourFrameElement);
   nsRefPtr<nsFrameMessageManager> ourMessageManager = mMessageManager;
   nsRefPtr<nsFrameMessageManager> otherMessageManager = aOther->mMessageManager;
   // Swap pointers in child message managers.
   if (mChildMessageManager) {
     nsInProcessTabChildGlobal* tabChild =
       static_cast<nsInProcessTabChildGlobal*>(mChildMessageManager.get());
     tabChild->SetOwner(otherContent);
     tabChild->SetChromeMessageManager(otherMessageManager);
   }
   if (aOther->mChildMessageManager) {
     nsInProcessTabChildGlobal* otherTabChild =
       static_cast<nsInProcessTabChildGlobal*>(aOther->mChildMessageManager.get());
     otherTabChild->SetOwner(ourContent);
     otherTabChild->SetChromeMessageManager(ourMessageManager);
   }
   // Swap and setup things in parent message managers.
   if (mMessageManager) {
     mMessageManager->SetCallback(aOther);
   }
   if (aOther->mMessageManager) {
     aOther->mMessageManager->SetCallback(this);
   }
   mMessageManager.swap(aOther->mMessageManager);
   aFirstToSwap.swap(aSecondToSwap);
   // Drop any cached content viewers in the two session histories.
   nsCOMPtr<nsISHistoryInternal> ourInternalHistory =
     do_QueryInterface(ourHistory);
   nsCOMPtr<nsISHistoryInternal> otherInternalHistory =
     do_QueryInterface(otherHistory);
   if (ourInternalHistory) {
     ourInternalHistory->EvictAllContentViewers();
   }
   if (otherInternalHistory) {
     otherInternalHistory->EvictAllContentViewers();
   }
   NS_ASSERTION(ourFrame == ourContent->GetPrimaryFrame() &&
                otherFrame == otherContent->GetPrimaryFrame(),
                "changed primary frame");
   ourFrameFrame->EndSwapDocShells(otherFrame);
   // If the content being swapped came from windows on two screens with
   // incompatible backing resolution (e.g. dragging a tab between windows on
   // hi-dpi and low-dpi screens), it will have style data that is based on
   // the wrong appUnitsPerDevPixel value. So we tell the PresShells that their
   // backing scale factor may have changed. (Bug 822266)
   ourShell->BackingScaleFactorChanged();
   otherShell->BackingScaleFactorChanged();
   ourParentDocument->FlushPendingNotifications(Flush_Layout);
   otherParentDocument->FlushPendingNotifications(Flush_Layout);
   FirePageShowEvent(ourDocshell, otherChromeEventHandler, true);
   FirePageShowEvent(otherDocshell, ourChromeEventHandler, true);
   mInSwap = aOther->mInSwap = false;
   return NS_OK;
 }
 void
 nsFrameLoader::DestroyChild()
 {
   if (mRemoteBrowser) {
     mRemoteBrowser->SetOwnerElement(nullptr);
     mRemoteBrowser->Destroy();
     mRemoteBrowser = nullptr;
   }
 }
 NS_IMETHODIMP
 nsFrameLoader::Destroy()
 {
   if (mDestroyCalled) {
     return NS_OK;
   }
   mDestroyCalled = true;
   if (mMessageManager) {
     mMessageManager->Disconnect();
   }
   if (mChildMessageManager) {
     static_cast<nsInProcessTabChildGlobal*>(mChildMessageManager.get())->Disconnect();
   }
   nsCOMPtr<nsIDocument> doc;
   bool dynamicSubframeRemoval = false;
   if (mOwnerContent) {
     doc = mOwnerContent->OwnerDoc();
     dynamicSubframeRemoval = !mIsTopLevelContent && !doc->InUnlinkOrDeletion();
     doc->SetSubDocumentFor(mOwnerContent, nullptr);
     SetOwnerContent(nullptr);
   }
   DestroyChild();
   // Seems like this is a dynamic frame removal.
   if (dynamicSubframeRemoval) {
     if (mDocShell) {
       mDocShell->RemoveFromSessionHistory();
     }
   }
   // Let the tree owner know we're gone.
   if (mIsTopLevelContent) {
     if (mDocShell) {
       nsCOMPtr<nsIDocShellTreeItem> parentItem;
       mDocShell->GetParent(getter_AddRefs(parentItem));
       nsCOMPtr<nsIDocShellTreeOwner> owner = do_GetInterface(parentItem);
       if (owner) {
         owner->ContentShellRemoved(mDocShell);
       }
     }
   }
   // Let our window know that we are gone
   nsCOMPtr<nsPIDOMWindow> win_private(do_GetInterface(mDocShell));
   if (win_private) {
     win_private->SetFrameElementInternal(nullptr);
   }
   if ((mNeedsAsyncDestroy || !doc ||
        NS_FAILED(doc->FinalizeFrameLoader(this))) && mDocShell) {
     nsCOMPtr<nsIRunnable> event = new nsAsyncDocShellDestroyer(mDocShell);
     NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY);
     NS_DispatchToCurrentThread(event);
     // Let go of our docshell now that the async destroyer holds on to
     // the docshell.
     mDocShell = nullptr;
   }
   // NOTE: 'this' may very well be gone by now.
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetDepthTooGreat(bool* aDepthTooGreat)
 {
   *aDepthTooGreat = mDepthTooGreat;
   return NS_OK;
 }
 void
 nsFrameLoader::SetOwnerContent(Element* aContent)
 {
   if (mObservingOwnerContent) {
     mObservingOwnerContent = false;
     mOwnerContent->RemoveMutationObserver(this);
   }
   mOwnerContent = aContent;
   if (RenderFrameParent* rfp = GetCurrentRemoteFrame()) {
     rfp->OwnerContentChanged(aContent);
   }
   ResetPermissionManagerStatus();
 }
 bool
 nsFrameLoader::OwnerIsBrowserOrAppFrame()
 {
   nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(mOwnerContent);
   return browserFrame ? browserFrame->GetReallyIsBrowserOrApp() : false;
 }
 // The xpcom getter version
 NS_IMETHODIMP
 nsFrameLoader::GetOwnerIsBrowserOrAppFrame(bool* aResult)
 {
   *aResult = OwnerIsBrowserOrAppFrame();
   return NS_OK;
 }
 bool
 nsFrameLoader::OwnerIsAppFrame()
 {
   nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(mOwnerContent);
   return browserFrame ? browserFrame->GetReallyIsApp() : false;
 }
 bool
 nsFrameLoader::OwnerIsBrowserFrame()
 {
   return OwnerIsBrowserOrAppFrame() && !OwnerIsAppFrame();
 }
 void
 nsFrameLoader::GetOwnerAppManifestURL(nsAString& aOut)
 {
   aOut.Truncate();
   nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(mOwnerContent);
   if (browserFrame) {
     browserFrame->GetAppManifestURL(aOut);
   }
 }
 already_AddRefed<mozIApplication>
 nsFrameLoader::GetOwnApp()
 {
   nsAutoString manifest;
   GetOwnerAppManifestURL(manifest);
   if (manifest.IsEmpty()) {
     return nullptr;
   }
   nsCOMPtr<nsIAppsService> appsService = do_GetService(APPS_SERVICE_CONTRACTID);
   NS_ENSURE_TRUE(appsService, nullptr);
   nsCOMPtr<mozIApplication> app;
   appsService->GetAppByManifestURL(manifest, getter_AddRefs(app));
   return app.forget();
 }
 already_AddRefed<mozIApplication>
 nsFrameLoader::GetContainingApp()
 {
   // See if our owner content's principal has an associated app.
   uint32_t appId = mOwnerContent->NodePrincipal()->GetAppId();
   MOZ_ASSERT(appId != nsIScriptSecurityManager::UNKNOWN_APP_ID);
   if (appId == nsIScriptSecurityManager::NO_APP_ID ||
       appId == nsIScriptSecurityManager::UNKNOWN_APP_ID) {
     return nullptr;
   }
   nsCOMPtr<nsIAppsService> appsService = do_GetService(APPS_SERVICE_CONTRACTID);
   NS_ENSURE_TRUE(appsService, nullptr);
   nsCOMPtr<mozIApplication> app;
   appsService->GetAppByLocalId(appId, getter_AddRefs(app));
   return app.forget();
 }
 bool
 nsFrameLoader::ShouldUseRemoteProcess()
 {
   if (PR_GetEnv("MOZ_DISABLE_OOP_TABS") ||
       Preferences::GetBool("dom.ipc.tabs.disabled", false)) {
     return false;
   }
   // If we're inside a content process, don't use a remote process for this
   // frame; it won't work properly until bug 761935 is fixed.
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     return false;
   }
   // If we're an <iframe mozbrowser> and we don't have a "remote" attribute,
   // fall back to the default.
   if (OwnerIsBrowserOrAppFrame() &&
       !mOwnerContent->HasAttr(kNameSpaceID_None, nsGkAtoms::Remote)) {
     return Preferences::GetBool("dom.ipc.browser_frames.oop_by_default", false);
   }
   // Otherwise, we're remote if we have "remote=true" and we're either a
   // browser frame or a XUL element.
   return (OwnerIsBrowserOrAppFrame() ||
           mOwnerContent->GetNameSpaceID() == kNameSpaceID_XUL) &&
          mOwnerContent->AttrValueIs(kNameSpaceID_None,
                                     nsGkAtoms::Remote,
                                     nsGkAtoms::_true,
                                     eCaseMatters);
 }
 nsresult
 nsFrameLoader::MaybeCreateDocShell()
 {
   if (mDocShell) {
     return NS_OK;
   }
   if (mRemoteFrame) {
     return NS_OK;
   }
   NS_ENSURE_STATE(!mDestroyCalled);
   if (ShouldUseRemoteProcess()) {
     mRemoteFrame = true;
     return NS_OK;
   }
   // Get our parent docshell off the document of mOwnerContent
   // XXXbz this is such a total hack.... We really need to have a
   // better setup for doing this.
   nsIDocument* doc = mOwnerContent->OwnerDoc();
   if (!(doc->IsStaticDocument() || mOwnerContent->IsInDoc())) {
     return NS_ERROR_UNEXPECTED;
   }
   if (doc->IsResourceDoc() || !doc->IsActive()) {
     // Don't allow subframe loads in resource documents, nor
     // in non-active documents.
     return NS_ERROR_NOT_AVAILABLE;
   }
   nsCOMPtr<nsIDocShell> docShell = doc->GetDocShell();
   nsCOMPtr<nsIWebNavigation> parentAsWebNav = do_QueryInterface(docShell);
   NS_ENSURE_STATE(parentAsWebNav);
   // Create the docshell...
   mDocShell = do_CreateInstance("@mozilla.org/docshell;1");
   NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
   // Apply sandbox flags even if our owner is not an iframe, as this copies
   // flags from our owning content's owning document.
   uint32_t sandboxFlags = 0;
   HTMLIFrameElement* iframe = HTMLIFrameElement::FromContent(mOwnerContent);
   if (iframe) {
     sandboxFlags = iframe->GetSandboxFlags();
   }
   ApplySandboxFlags(sandboxFlags);
   if (!mNetworkCreated) {
     if (mDocShell) {
       mDocShell->SetCreatedDynamically(true);
     }
   }
   // Get the frame name and tell the docshell about it.
   NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
   nsAutoString frameName;
   int32_t namespaceID = mOwnerContent->GetNameSpaceID();
   if (namespaceID == kNameSpaceID_XHTML && !mOwnerContent->IsInHTMLDocument()) {
     mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::id, frameName);
   } else {
     mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::name, frameName);
     // XXX if no NAME then use ID, after a transition period this will be
     // changed so that XUL only uses ID too (bug 254284).
     if (frameName.IsEmpty() && namespaceID == kNameSpaceID_XUL) {
       mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::id, frameName);
     }
   }
   if (!frameName.IsEmpty()) {
     mDocShell->SetName(frameName);
   }
   // Inform our docShell that it has a new child.
   // Note: This logic duplicates a lot of logic in
   // nsSubDocumentFrame::AttributeChanged.  We should fix that.
   int32_t parentType = docShell->ItemType();
   // XXXbz why is this in content code, exactly?  We should handle
   // this some other way.....  Not sure how yet.
   nsCOMPtr<nsIDocShellTreeOwner> parentTreeOwner;
   docShell->GetTreeOwner(getter_AddRefs(parentTreeOwner));
   NS_ENSURE_STATE(parentTreeOwner);
   mIsTopLevelContent =
     AddTreeItemToTreeOwner(mDocShell, parentTreeOwner, parentType, docShell);
   // Make sure all shells have links back to the content element
   // in the nearest enclosing chrome shell.
   nsCOMPtr<nsIDOMEventTarget> chromeEventHandler;
   if (parentType == nsIDocShellTreeItem::typeChrome) {
     // Our parent shell is a chrome shell. It is therefore our nearest
     // enclosing chrome shell.
     chromeEventHandler = do_QueryInterface(mOwnerContent);
     NS_ASSERTION(chromeEventHandler,
                  "This mContent should implement this.");
   } else {
     // Our parent shell is a content shell. Get the chrome event
     // handler from it and use that for our shell as well.
     docShell->GetChromeEventHandler(getter_AddRefs(chromeEventHandler));
   }
   mDocShell->SetChromeEventHandler(chromeEventHandler);
   // This is nasty, this code (the do_GetInterface(mDocShell) below)
   // *must* come *after* the above call to
   // mDocShell->SetChromeEventHandler() for the global window to get
   // the right chrome event handler.
   // Tell the window about the frame that hosts it.
   nsCOMPtr<Element> frame_element = mOwnerContent;
   NS_ASSERTION(frame_element, "frame loader owner element not a DOM element!");
   nsCOMPtr<nsPIDOMWindow> win_private(do_GetInterface(mDocShell));
   nsCOMPtr<nsIBaseWindow> base_win(do_QueryInterface(mDocShell));
   if (win_private) {
     win_private->SetFrameElementInternal(frame_element);
   }
   // This is kinda whacky, this call doesn't really create anything,
   // but it must be called to make sure things are properly
   // initialized.
   if (NS_FAILED(base_win->Create()) || !win_private) {
     // Do not call Destroy() here. See bug 472312.
     NS_WARNING("Something wrong when creating the docshell for a frameloader!");
     return NS_ERROR_FAILURE;
   }
   if (mIsTopLevelContent &&
       mOwnerContent->IsXUL(nsGkAtoms::browser) &&
       !mOwnerContent->HasAttr(kNameSpaceID_None, nsGkAtoms::disablehistory)) {
     nsresult rv;
     nsCOMPtr<nsISHistory> sessionHistory =
       do_CreateInstance(NS_SHISTORY_CONTRACTID, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(mDocShell));
     webNav->SetSessionHistory(sessionHistory);
   }
   EnsureMessageManager();
   if (OwnerIsAppFrame()) {
     // You can't be both an app and a browser frame.
     MOZ_ASSERT(!OwnerIsBrowserFrame());
     nsCOMPtr<mozIApplication> ownApp = GetOwnApp();
     MOZ_ASSERT(ownApp);
     uint32_t ownAppId = nsIScriptSecurityManager::NO_APP_ID;
     if (ownApp) {
       NS_ENSURE_SUCCESS(ownApp->GetLocalId(&ownAppId), NS_ERROR_FAILURE);
     }
     mDocShell->SetIsApp(ownAppId);
   }
   if (OwnerIsBrowserFrame()) {
     // You can't be both a browser and an app frame.
     MOZ_ASSERT(!OwnerIsAppFrame());
     nsCOMPtr<mozIApplication> containingApp = GetContainingApp();
     uint32_t containingAppId = nsIScriptSecurityManager::NO_APP_ID;
     if (containingApp) {
       NS_ENSURE_SUCCESS(containingApp->GetLocalId(&containingAppId),
                         NS_ERROR_FAILURE);
     }
     mDocShell->SetIsBrowserInsideApp(containingAppId);
   }
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   if (os) {
     os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
                         "inprocess-browser-shown", nullptr);
   }
   if (OwnerIsBrowserOrAppFrame() && mMessageManager) {
     mMessageManager->LoadFrameScript(
       NS_LITERAL_STRING("chrome://global/content/BrowserElementChild.js"),
       /* allowDelayedLoad = */ true,
       /* aRunInGlobalScope */ true);
   }
   return NS_OK;
 }
 void
 nsFrameLoader::GetURL(nsString& aURI)
 {
   aURI.Truncate();
   if (mOwnerContent->Tag() == nsGkAtoms::object) {
     mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::data, aURI);
   } else {
     mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::src, aURI);
   }
 }
 nsresult
 nsFrameLoader::CheckForRecursiveLoad(nsIURI* aURI)
 {
   nsresult rv;
   mDepthTooGreat = false;
   rv = MaybeCreateDocShell();
   if (NS_FAILED(rv)) {
     return rv;
   }
   NS_ASSERTION(!mRemoteFrame,
                "Shouldn't call CheckForRecursiveLoad on remote frames.");
   if (!mDocShell) {
     return NS_ERROR_FAILURE;
   }
   // Check that we're still in the docshell tree.
   nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
   mDocShell->GetTreeOwner(getter_AddRefs(treeOwner));
   NS_WARN_IF_FALSE(treeOwner,
                    "Trying to load a new url to a docshell without owner!");
   NS_ENSURE_STATE(treeOwner);
   if (mDocShell->ItemType() != nsIDocShellTreeItem::typeContent) {
     // No need to do recursion-protection here XXXbz why not??  Do we really
     // trust people not to screw up with non-content docshells?
     return NS_OK;
   }
   // Bug 8065: Don't exceed some maximum depth in content frames
   // (MAX_DEPTH_CONTENT_FRAMES)
   nsCOMPtr<nsIDocShellTreeItem> parentAsItem;
   mDocShell->GetSameTypeParent(getter_AddRefs(parentAsItem));
   int32_t depth = 0;
   while (parentAsItem) {
     ++depth;
     if (depth >= MAX_DEPTH_CONTENT_FRAMES) {
       mDepthTooGreat = true;
       NS_WARNING("Too many nested content frames so giving up");
       return NS_ERROR_UNEXPECTED; // Too deep, give up!  (silently?)
     }
     nsCOMPtr<nsIDocShellTreeItem> temp;
     temp.swap(parentAsItem);
     temp->GetSameTypeParent(getter_AddRefs(parentAsItem));
   }
   // Bug 136580: Check for recursive frame loading excluding about:srcdoc URIs.
   // srcdoc URIs require their contents to be specified inline, so it isn't
   // possible for undesirable recursion to occur without the aid of a
   // non-srcdoc URI,  which this method will block normally.
   // Besides, URI is not enough to guarantee uniqueness of srcdoc documents.
   nsAutoCString buffer;
   rv = aURI->GetScheme(buffer);
   if (NS_SUCCEEDED(rv) && buffer.EqualsLiteral("about")) {
     rv = aURI->GetPath(buffer);
     if (NS_SUCCEEDED(rv) && buffer.EqualsLiteral("srcdoc")) {
       // Duplicates allowed up to depth limits
       return NS_OK;
     }
   }
   int32_t matchCount = 0;
   mDocShell->GetSameTypeParent(getter_AddRefs(parentAsItem));
   while (parentAsItem) {
     // Check the parent URI with the URI we're loading
     nsCOMPtr<nsIWebNavigation> parentAsNav(do_QueryInterface(parentAsItem));
     if (parentAsNav) {
       // Does the URI match the one we're about to load?
       nsCOMPtr<nsIURI> parentURI;
       parentAsNav->GetCurrentURI(getter_AddRefs(parentURI));
       if (parentURI) {
         // Bug 98158/193011: We need to ignore data after the #
         bool equal;
         rv = aURI->EqualsExceptRef(parentURI, &equal);
         NS_ENSURE_SUCCESS(rv, rv);
         if (equal) {
           matchCount++;
           if (matchCount >= MAX_SAME_URL_CONTENT_FRAMES) {
             NS_WARNING("Too many nested content frames have the same url (recursion?) so giving up");
             return NS_ERROR_UNEXPECTED;
           }
         }
       }
     }
     nsCOMPtr<nsIDocShellTreeItem> temp;
     temp.swap(parentAsItem);
     temp->GetSameTypeParent(getter_AddRefs(parentAsItem));
   }
   return NS_OK;
 }
 nsresult
 nsFrameLoader::GetWindowDimensions(nsRect& aRect)
 {
   // Need to get outer window position here
   nsIDocument* doc = mOwnerContent->GetDocument();
   if (!doc) {
     return NS_ERROR_FAILURE;
   }
   if (doc->IsResourceDoc()) {
     return NS_ERROR_FAILURE;
   }
   nsCOMPtr<nsIWebNavigation> parentAsWebNav =
     do_GetInterface(doc->GetWindow());
   if (!parentAsWebNav) {
     return NS_ERROR_FAILURE;
   }
   nsCOMPtr<nsIDocShellTreeItem> parentAsItem(do_QueryInterface(parentAsWebNav));
   nsCOMPtr<nsIDocShellTreeOwner> parentOwner;
   if (NS_FAILED(parentAsItem->GetTreeOwner(getter_AddRefs(parentOwner))) ||
       !parentOwner) {
     return NS_ERROR_FAILURE;
   }
   nsCOMPtr<nsIBaseWindow> treeOwnerAsWin(do_GetInterface(parentOwner));
   treeOwnerAsWin->GetPosition(&aRect.x, &aRect.y);
   treeOwnerAsWin->GetSize(&aRect.width, &aRect.height);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::UpdatePositionAndSize(nsSubDocumentFrame *aIFrame)
 {
   if (mRemoteFrame) {
     if (mRemoteBrowser) {
       nsIntSize size = aIFrame->GetSubdocumentSize();
       nsRect dimensions;
       NS_ENSURE_SUCCESS(GetWindowDimensions(dimensions), NS_ERROR_FAILURE);
       mRemoteBrowser->UpdateDimensions(dimensions, size);
     }
     return NS_OK;
   }
   return UpdateBaseWindowPositionAndSize(aIFrame);
 }
 nsresult
 nsFrameLoader::UpdateBaseWindowPositionAndSize(nsSubDocumentFrame *aIFrame)
 {
   nsCOMPtr<nsIDocShell> docShell;
   GetDocShell(getter_AddRefs(docShell));
   nsCOMPtr<nsIBaseWindow> baseWindow(do_QueryInterface(docShell));
   // resize the sub document
   if (baseWindow) {
     int32_t x = 0;
     int32_t y = 0;
     nsWeakFrame weakFrame(aIFrame);
     baseWindow->GetPositionAndSize(&x, &y, nullptr, nullptr);
     if (!weakFrame.IsAlive()) {
       // GetPositionAndSize() killed us
       return NS_OK;
     }
     nsIntSize size = aIFrame->GetSubdocumentSize();
     baseWindow->SetPositionAndSize(x, y, size.width, size.height, false);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetRenderMode(uint32_t* aRenderMode)
 {
   *aRenderMode = mRenderMode;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::SetRenderMode(uint32_t aRenderMode)
 {
   if (aRenderMode == mRenderMode) {
     return NS_OK;
   }
   mRenderMode = aRenderMode;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetEventMode(uint32_t* aEventMode)
 {
   *aEventMode = mEventMode;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::SetEventMode(uint32_t aEventMode)
 {
   mEventMode = aEventMode;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetClipSubdocument(bool* aResult)
 {
   *aResult = mClipSubdocument;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::SetClipSubdocument(bool aClip)
 {
   mClipSubdocument = aClip;
   nsIFrame* frame = GetPrimaryFrameOfOwningContent();
   if (frame) {
     frame->InvalidateFrame();
     frame->PresContext()->PresShell()->
       FrameNeedsReflow(frame, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
     nsSubDocumentFrame* subdocFrame = do_QueryFrame(frame);
     if (subdocFrame) {
       nsIFrame* subdocRootFrame = subdocFrame->GetSubdocumentRootFrame();
       if (subdocRootFrame) {
         nsIFrame* subdocRootScrollFrame = subdocRootFrame->PresContext()->PresShell()->
           GetRootScrollFrame();
         if (subdocRootScrollFrame) {
           frame->PresContext()->PresShell()->
             FrameNeedsReflow(frame, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
         }
       }
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetClampScrollPosition(bool* aResult)
 {
   *aResult = mClampScrollPosition;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::SetClampScrollPosition(bool aClamp)
 {
   mClampScrollPosition = aClamp;
   // When turning clamping on, make sure the current position is clamped.
   if (aClamp) {
     nsIFrame* frame = GetPrimaryFrameOfOwningContent();
     nsSubDocumentFrame* subdocFrame = do_QueryFrame(frame);
     if (subdocFrame) {
       nsIFrame* subdocRootFrame = subdocFrame->GetSubdocumentRootFrame();
       if (subdocRootFrame) {
         nsIScrollableFrame* subdocRootScrollFrame = subdocRootFrame->PresContext()->PresShell()->
           GetRootScrollFrameAsScrollable();
         if (subdocRootScrollFrame) {
           subdocRootScrollFrame->ScrollTo(subdocRootScrollFrame->GetScrollPosition(), nsIScrollableFrame::INSTANT);
         }
       }
     }
   }
   return NS_OK;
 }
 bool
 nsFrameLoader::TryRemoteBrowser()
 {
   NS_ASSERTION(!mRemoteBrowser, "TryRemoteBrowser called with a remote browser already?");
   nsIDocument* doc = mOwnerContent->GetDocument();
   if (!doc) {
     return false;
   }
   if (doc->IsResourceDoc()) {
     // Don't allow subframe loads in external reference documents
     return false;
   }
   nsCOMPtr<nsIWebNavigation> parentAsWebNav =
     do_GetInterface(doc->GetWindow());
   if (!parentAsWebNav) {
     return false;
   }
   nsCOMPtr<nsIDocShellTreeItem> parentAsItem(do_QueryInterface(parentAsWebNav));
   // <iframe mozbrowser> gets to skip these checks.
   if (!OwnerIsBrowserOrAppFrame()) {
     if (parentAsItem->ItemType() != nsIDocShellTreeItem::typeChrome) {
       return false;
     }
     if (!mOwnerContent->IsXUL()) {
       return false;
     }
     nsAutoString value;
     mOwnerContent->GetAttr(kNameSpaceID_None, nsGkAtoms::type, value);
     if (!value.LowerCaseEqualsLiteral("content") &&
         !StringBeginsWith(value, NS_LITERAL_STRING("content-"),
                           nsCaseInsensitiveStringComparator())) {
       return false;
     }
   }
   uint32_t chromeFlags = 0;
   nsCOMPtr<nsIDocShellTreeOwner> parentOwner;
   if (NS_FAILED(parentAsItem->GetTreeOwner(getter_AddRefs(parentOwner))) ||
       !parentOwner) {
     return false;
   }
   nsCOMPtr<nsIXULWindow> window(do_GetInterface(parentOwner));
   if (!window) {
     return false;
   }
   if (NS_FAILED(window->GetChromeFlags(&chromeFlags))) {
     return false;
   }
   PROFILER_LABEL("nsFrameLoader", "CreateRemoteBrowser");
   MutableTabContext context;
   nsCOMPtr<mozIApplication> ownApp = GetOwnApp();
   nsCOMPtr<mozIApplication> containingApp = GetContainingApp();
   ScrollingBehavior scrollingBehavior = DEFAULT_SCROLLING;
   if (Preferences::GetBool("dom.browser_frames.useAsyncPanZoom", false) ||
       mOwnerContent->AttrValueIs(kNameSpaceID_None,
                                  nsGkAtoms::mozasyncpanzoom,
                                  nsGkAtoms::_true,
                                  eCaseMatters)) {
     scrollingBehavior = ASYNC_PAN_ZOOM;
   }
   bool rv = true;
   if (ownApp) {
     rv = context.SetTabContextForAppFrame(ownApp, containingApp, scrollingBehavior);
   } else if (OwnerIsBrowserFrame()) {
     // The |else| above is unnecessary; OwnerIsBrowserFrame() implies !ownApp.
     rv = context.SetTabContextForBrowserFrame(containingApp, scrollingBehavior);
   } else {
     rv = context.SetTabContextForNormalFrame(scrollingBehavior);
   }
   NS_ENSURE_TRUE(rv, false);
   nsCOMPtr<Element> ownerElement = mOwnerContent;
   mRemoteBrowser = ContentParent::CreateBrowserOrApp(context, ownerElement);
   if (mRemoteBrowser) {
     mChildID = mRemoteBrowser->Manager()->ChildID();
     nsCOMPtr<nsIDocShellTreeItem> rootItem;
     parentAsItem->GetRootTreeItem(getter_AddRefs(rootItem));
     nsCOMPtr<nsIDOMWindow> rootWin = do_GetInterface(rootItem);
     nsCOMPtr<nsIDOMChromeWindow> rootChromeWin = do_QueryInterface(rootWin);
     NS_ABORT_IF_FALSE(rootChromeWin, "How did we not get a chrome window here?");
     nsCOMPtr<nsIBrowserDOMWindow> browserDOMWin;
     rootChromeWin->GetBrowserDOMWindow(getter_AddRefs(browserDOMWin));
     mRemoteBrowser->SetBrowserDOMWindow(browserDOMWin);
     mContentParent = mRemoteBrowser->Manager();
     if (mOwnerContent->AttrValueIs(kNameSpaceID_None,
                                    nsGkAtoms::mozpasspointerevents,
                                    nsGkAtoms::_true,
                                    eCaseMatters)) {
       unused << mRemoteBrowser->SendSetUpdateHitRegion(true);
     }
   }
   return true;
 }
 mozilla::dom::PBrowserParent*
 nsFrameLoader::GetRemoteBrowser()
 {
   return mRemoteBrowser;
 }
 NS_IMETHODIMP
 nsFrameLoader::ActivateRemoteFrame() {
   if (mRemoteBrowser) {
     mRemoteBrowser->Activate();
     return NS_OK;
   }
   return NS_ERROR_UNEXPECTED;
 }
 NS_IMETHODIMP
 nsFrameLoader::DeactivateRemoteFrame() {
   if (mRemoteBrowser) {
     mRemoteBrowser->Deactivate();
     return NS_OK;
   }
   return NS_ERROR_UNEXPECTED;
 }
 NS_IMETHODIMP
 nsFrameLoader::SendCrossProcessMouseEvent(const nsAString& aType,
                                           float aX,
                                           float aY,
                                           int32_t aButton,
                                           int32_t aClickCount,
                                           int32_t aModifiers,
                                           bool aIgnoreRootScrollFrame)
 {
   if (mRemoteBrowser) {
     mRemoteBrowser->SendMouseEvent(aType, aX, aY, aButton,
                                    aClickCount, aModifiers,
                                    aIgnoreRootScrollFrame);
     return NS_OK;
   }
   return NS_ERROR_FAILURE;
 }
 NS_IMETHODIMP
 nsFrameLoader::ActivateFrameEvent(const nsAString& aType,
                                   bool aCapture)
 {
   if (mRemoteBrowser) {
     return mRemoteBrowser->SendActivateFrameEvent(nsString(aType), aCapture) ?
       NS_OK : NS_ERROR_NOT_AVAILABLE;
   }
   return NS_ERROR_FAILURE;
 }
 NS_IMETHODIMP
 nsFrameLoader::SendCrossProcessKeyEvent(const nsAString& aType,
                                         int32_t aKeyCode,
                                         int32_t aCharCode,
                                         int32_t aModifiers,
                                         bool aPreventDefault)
 {
   if (mRemoteBrowser) {
     mRemoteBrowser->SendKeyEvent(aType, aKeyCode, aCharCode, aModifiers,
                                  aPreventDefault);
     return NS_OK;
   }
   return NS_ERROR_FAILURE;
 }
 nsresult
 nsFrameLoader::CreateStaticClone(nsIFrameLoader* aDest)
 {
   nsFrameLoader* dest = static_cast<nsFrameLoader*>(aDest);
   dest->MaybeCreateDocShell();
   NS_ENSURE_STATE(dest->mDocShell);
   nsCOMPtr<nsIDocument> dummy = do_GetInterface(dest->mDocShell);
   nsCOMPtr<nsIContentViewer> viewer;
   dest->mDocShell->GetContentViewer(getter_AddRefs(viewer));
   NS_ENSURE_STATE(viewer);
   nsCOMPtr<nsIDocShell> origDocShell;
   GetDocShell(getter_AddRefs(origDocShell));
   nsCOMPtr<nsIDocument> doc = do_GetInterface(origDocShell);
   NS_ENSURE_STATE(doc);
   nsCOMPtr<nsIDocument> clonedDoc = doc->CreateStaticClone(dest->mDocShell);
   nsCOMPtr<nsIDOMDocument> clonedDOMDoc = do_QueryInterface(clonedDoc);
   viewer->SetDOMDocument(clonedDOMDoc);
   return NS_OK;
 }
 bool
 nsFrameLoader::DoLoadFrameScript(const nsAString& aURL, bool aRunInGlobalScope)
 {
   mozilla::dom::PBrowserParent* tabParent = GetRemoteBrowser();
   if (tabParent) {
     return tabParent->SendLoadRemoteScript(nsString(aURL), aRunInGlobalScope);
   }
   nsRefPtr<nsInProcessTabChildGlobal> tabChild =
     static_cast<nsInProcessTabChildGlobal*>(GetTabChildGlobalAsEventTarget());
   if (tabChild) {
     tabChild->LoadFrameScript(aURL, aRunInGlobalScope);
   }
   return true;
 }
 class nsAsyncMessageToChild : public nsSameProcessAsyncMessageBase,
                               public nsRunnable
 {
 public:
   nsAsyncMessageToChild(JSContext* aCx,
                         nsFrameLoader* aFrameLoader,
                         const nsAString& aMessage,
                         const StructuredCloneData& aData,
                         JS::Handle<JSObject *> aCpows,
                         nsIPrincipal* aPrincipal)
     : nsSameProcessAsyncMessageBase(aCx, aMessage, aData, aCpows, aPrincipal)
     , mFrameLoader(aFrameLoader)
   {
   }
   NS_IMETHOD Run()
   {
     nsInProcessTabChildGlobal* tabChild =
       static_cast<nsInProcessTabChildGlobal*>(mFrameLoader->mChildMessageManager.get());
     if (tabChild && tabChild->GetInnerManager()) {
       nsCOMPtr<nsIXPConnectJSObjectHolder> kungFuDeathGrip(tabChild->GetGlobal());
       ReceiveMessage(static_cast<EventTarget*>(tabChild),
                      tabChild->GetInnerManager());
     }
     return NS_OK;
   }
   nsRefPtr<nsFrameLoader> mFrameLoader;
 };
 bool
 nsFrameLoader::DoSendAsyncMessage(JSContext* aCx,
                                   const nsAString& aMessage,
                                   const StructuredCloneData& aData,
                                   JS::Handle<JSObject *> aCpows,
                                   nsIPrincipal* aPrincipal)
 {
   TabParent* tabParent = mRemoteBrowser;
   if (tabParent) {
     ClonedMessageData data;
     ContentParent* cp = tabParent->Manager();
     if (!BuildClonedMessageDataForParent(cp, aData, data)) {
       return false;
     }
     InfallibleTArray<mozilla::jsipc::CpowEntry> cpows;
     if (aCpows && !cp->GetCPOWManager()->Wrap(aCx, aCpows, &cpows)) {
       return false;
     }
     return tabParent->SendAsyncMessage(nsString(aMessage), data, cpows,
                                        aPrincipal);
   }
   if (mChildMessageManager) {
     nsRefPtr<nsIRunnable> ev = new nsAsyncMessageToChild(aCx, this, aMessage,
                                                          aData, aCpows,
                                                          aPrincipal);
     NS_DispatchToCurrentThread(ev);
     return true;
   }
   // We don't have any targets to send our asynchronous message to.
   return false;
 }
 bool
 nsFrameLoader::CheckPermission(const nsAString& aPermission)
 {
   return AssertAppProcessPermission(GetRemoteBrowser(),
                                     NS_ConvertUTF16toUTF8(aPermission).get());
 }
 bool
 nsFrameLoader::CheckManifestURL(const nsAString& aManifestURL)
 {
   return AssertAppProcessManifestURL(GetRemoteBrowser(),
                                      NS_ConvertUTF16toUTF8(aManifestURL).get());
 }
 bool
 nsFrameLoader::CheckAppHasPermission(const nsAString& aPermission)
 {
   return AssertAppHasPermission(GetRemoteBrowser(),
                                 NS_ConvertUTF16toUTF8(aPermission).get());
 }
 NS_IMETHODIMP
 nsFrameLoader::GetMessageManager(nsIMessageSender** aManager)
 {
   EnsureMessageManager();
   if (mMessageManager) {
     CallQueryInterface(mMessageManager, aManager);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetContentViewsIn(float aXPx, float aYPx,
                                  float aTopSize, float aRightSize,
                                  float aBottomSize, float aLeftSize,
                                  uint32_t* aLength,
                                  nsIContentView*** aResult)
 {
   nscoord x = nsPresContext::CSSPixelsToAppUnits(aXPx - aLeftSize);
   nscoord y = nsPresContext::CSSPixelsToAppUnits(aYPx - aTopSize);
   nscoord w = nsPresContext::CSSPixelsToAppUnits(aLeftSize + aRightSize) + 1;
   nscoord h = nsPresContext::CSSPixelsToAppUnits(aTopSize + aBottomSize) + 1;
   nsRect target(x, y, w, h);
   nsIFrame* frame = GetPrimaryFrameOfOwningContent();
   nsTArray<ViewID> ids;
   nsLayoutUtils::GetRemoteContentIds(frame, target, ids, true);
   if (ids.Length() == 0 || !GetCurrentRemoteFrame()) {
     *aResult = nullptr;
     *aLength = 0;
     return NS_OK;
   }
   nsIContentView** result = reinterpret_cast<nsIContentView**>(
     NS_Alloc(ids.Length() * sizeof(nsIContentView*)));
   for (uint32_t i = 0; i < ids.Length(); i++) {
     nsIContentView* view = GetCurrentRemoteFrame()->GetContentView(ids[i]);
     NS_ABORT_IF_FALSE(view, "Retrieved ID from RenderFrameParent, it should be valid!");
     nsRefPtr<nsIContentView>(view).forget(&result[i]);
   }
   *aResult = result;
   *aLength = ids.Length();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetRootContentView(nsIContentView** aContentView)
 {
   RenderFrameParent* rfp = GetCurrentRemoteFrame();
   if (!rfp) {
     *aContentView = nullptr;
     return NS_OK;
   }
   nsContentView* view = rfp->GetRootContentView();
   NS_ABORT_IF_FALSE(view, "Should always be able to create root scrollable!");
   nsRefPtr<nsIContentView>(view).forget(aContentView);
   return NS_OK;
 }
 nsresult
 nsFrameLoader::EnsureMessageManager()
 {
   NS_ENSURE_STATE(mOwnerContent);
   nsresult rv = MaybeCreateDocShell();
   if (NS_FAILED(rv)) {
     return rv;
   }
   if (!mIsTopLevelContent && !OwnerIsBrowserOrAppFrame() && !mRemoteFrame) {
     return NS_OK;
   }
   if (mMessageManager) {
     if (ShouldUseRemoteProcess() && mRemoteBrowserShown) {
       mMessageManager->InitWithCallback(this);
     }
     return NS_OK;
   }
   nsIScriptContext* sctx = mOwnerContent->GetContextForEventHandlers(&rv);
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ENSURE_STATE(sctx);
   AutoPushJSContext cx(sctx->GetNativeContext());
   NS_ENSURE_STATE(cx);
   nsCOMPtr<nsIDOMChromeWindow> chromeWindow =
     do_QueryInterface(GetOwnerDoc()->GetWindow());
   nsCOMPtr<nsIMessageBroadcaster> parentManager;
   if (chromeWindow) {
     chromeWindow->GetMessageManager(getter_AddRefs(parentManager));
   }
   if (ShouldUseRemoteProcess()) {
     mMessageManager = new nsFrameMessageManager(mRemoteBrowserShown ? this : nullptr,
                                                 static_cast<nsFrameMessageManager*>(parentManager.get()),
                                                 MM_CHROME);
   } else {
     mMessageManager = new nsFrameMessageManager(nullptr,
                                                 static_cast<nsFrameMessageManager*>(parentManager.get()),
                                                 MM_CHROME);
     mChildMessageManager =
       new nsInProcessTabChildGlobal(mDocShell, mOwnerContent, mMessageManager);
     // Force pending frame scripts to be loaded.
     mMessageManager->InitWithCallback(this);
   }
   return NS_OK;
 }
 EventTarget*
 nsFrameLoader::GetTabChildGlobalAsEventTarget()
 {
   return static_cast<nsInProcessTabChildGlobal*>(mChildMessageManager.get());
 }
 NS_IMETHODIMP
 nsFrameLoader::GetOwnerElement(nsIDOMElement **aElement)
 {
   nsCOMPtr<nsIDOMElement> ownerElement = do_QueryInterface(mOwnerContent);
   ownerElement.forget(aElement);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetChildID(uint64_t* aChildID)
 {
   *aChildID = mChildID;
   return NS_OK;
 }
 void
 nsFrameLoader::SetRemoteBrowser(nsITabParent* aTabParent)
 {
   MOZ_ASSERT(!mRemoteBrowser);
   MOZ_ASSERT(!mCurrentRemoteFrame);
   mRemoteFrame = true;
   mRemoteBrowser = static_cast<TabParent*>(aTabParent);
   mChildID = mRemoteBrowser ? mRemoteBrowser->Manager()->ChildID() : 0;
   ShowRemoteFrame(nsIntSize(0, 0));
 }
 void
 nsFrameLoader::SetDetachedSubdocView(nsView* aDetachedViews,
                                      nsIDocument* aContainerDoc)
 {
   mDetachedSubdocViews = aDetachedViews;
   mContainerDocWhileDetached = aContainerDoc;
 }
 nsView*
 nsFrameLoader::GetDetachedSubdocView(nsIDocument** aContainerDoc) const
 {
   NS_IF_ADDREF(*aContainerDoc = mContainerDocWhileDetached);
   return mDetachedSubdocViews;
 }
 void
 nsFrameLoader::ApplySandboxFlags(uint32_t sandboxFlags)
 {
   if (mDocShell) {
     uint32_t parentSandboxFlags = mOwnerContent->OwnerDoc()->GetSandboxFlags();
     // The child can only add restrictions, never remove them.
     sandboxFlags |= parentSandboxFlags;
     mDocShell->SetSandboxFlags(sandboxFlags);
   }
 }
 /* virtual */ void
 nsFrameLoader::AttributeChanged(nsIDocument* aDocument,
                                 mozilla::dom::Element* aElement,
                                 int32_t      aNameSpaceID,
                                 nsIAtom*     aAttribute,
                                 int32_t      aModType)
 {
   MOZ_ASSERT(mObservingOwnerContent);
   // TODO: Implement ContentShellAdded for remote browsers (bug 658304)
   MOZ_ASSERT(!mRemoteBrowser);
   if (aNameSpaceID != kNameSpaceID_None || aAttribute != TypeAttrName()) {
     return;
   }
   if (aElement != mOwnerContent) {
     return;
   }
   // Note: This logic duplicates a lot of logic in
   // MaybeCreateDocshell.  We should fix that.
   // Notify our enclosing chrome that our type has changed.  We only do this
   // if our parent is chrome, since in all other cases we're random content
   // subframes and the treeowner shouldn't worry about us.
   if (!mDocShell) {
     return;
   }
   nsCOMPtr<nsIDocShellTreeItem> parentItem;
   mDocShell->GetParent(getter_AddRefs(parentItem));
   if (!parentItem) {
     return;
   }
   if (parentItem->ItemType() != nsIDocShellTreeItem::typeChrome) {
     return;
   }
   nsCOMPtr<nsIDocShellTreeOwner> parentTreeOwner;
   parentItem->GetTreeOwner(getter_AddRefs(parentTreeOwner));
   if (!parentTreeOwner) {
     return;
   }
   nsAutoString value;
   aElement->GetAttr(kNameSpaceID_None, TypeAttrName(), value);
   bool is_primary = value.LowerCaseEqualsLiteral("content-primary");
 #ifdef MOZ_XUL
   // when a content panel is no longer primary, hide any open popups it may have
   if (!is_primary) {
     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
     if (pm)
       pm->HidePopupsInDocShell(mDocShell);
   }
 #endif
   parentTreeOwner->ContentShellRemoved(mDocShell);
   if (value.LowerCaseEqualsLiteral("content") ||
       StringBeginsWith(value, NS_LITERAL_STRING("content-"),
                        nsCaseInsensitiveStringComparator())) {
     bool is_targetable = is_primary ||
       value.LowerCaseEqualsLiteral("content-targetable");
     parentTreeOwner->ContentShellAdded(mDocShell, is_primary,
                                        is_targetable, value);
   }
 }
 void
 nsFrameLoader::ResetPermissionManagerStatus()
 {
   // The resetting of the permissions status can run only
   // in the main process.
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     return;
   }
   // Finding the new app Id:
   // . first we check if the owner is an app frame
   // . second, we check if the owner is a browser frame
   // in both cases we populate the appId variable.
   uint32_t appId = nsIScriptSecurityManager::NO_APP_ID;
   if (OwnerIsAppFrame()) {
     // You can't be both an app and a browser frame.
     MOZ_ASSERT(!OwnerIsBrowserFrame());
     nsCOMPtr<mozIApplication> ownApp = GetOwnApp();
     MOZ_ASSERT(ownApp);
     uint32_t ownAppId = nsIScriptSecurityManager::NO_APP_ID;
     if (ownApp && NS_SUCCEEDED(ownApp->GetLocalId(&ownAppId))) {
       appId = ownAppId;
     }
   }
   if (OwnerIsBrowserFrame()) {
     // You can't be both a browser and an app frame.
     MOZ_ASSERT(!OwnerIsAppFrame());
     nsCOMPtr<mozIApplication> containingApp = GetContainingApp();
     uint32_t containingAppId = nsIScriptSecurityManager::NO_APP_ID;
     if (containingApp && NS_SUCCEEDED(containingApp->GetLocalId(&containingAppId))) {
       appId = containingAppId;
     }
   }
   // Nothing changed.
   if (appId == mAppIdSentToPermissionManager) {
     return;
   }
   nsCOMPtr<nsIPermissionManager> permMgr = do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
   if (!permMgr) {
     NS_ERROR("No PermissionManager available!");
     return;
   }
   // If previously we registered an appId, we have to unregister it.
   if (mAppIdSentToPermissionManager != nsIScriptSecurityManager::NO_APP_ID) {
     permMgr->ReleaseAppId(mAppIdSentToPermissionManager);
     mAppIdSentToPermissionManager = nsIScriptSecurityManager::NO_APP_ID;
   }
   // Register the new AppId.
   if (appId != nsIScriptSecurityManager::NO_APP_ID) {
     mAppIdSentToPermissionManager = appId;
     permMgr->AddrefAppId(mAppIdSentToPermissionManager);
   }
 }
 /* [infallible] */ NS_IMETHODIMP
 nsFrameLoader::SetVisible(bool aVisible)
 {
   if (mVisible == aVisible) {
     return NS_OK;
   }
   mVisible = aVisible;
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   if (os) {
     os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
                         "frameloader-visible-changed", nullptr);
   }
   return NS_OK;
 }
 /* [infallible] */ NS_IMETHODIMP
 nsFrameLoader::GetVisible(bool* aVisible)
 {
   *aVisible = mVisible;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetTabParent(nsITabParent** aTabParent)
 {
   nsCOMPtr<nsITabParent> tp = mRemoteBrowser;
   tp.forget(aTabParent);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsFrameLoader::GetLoadContext(nsILoadContext** aLoadContext)
 {
   nsCOMPtr<nsILoadContext> loadContext;
   if (mRemoteBrowser) {
     loadContext = mRemoteBrowser->GetLoadContext();
   } else {
     nsCOMPtr<nsIDocShell> docShell;
     GetDocShell(getter_AddRefs(docShell));
     loadContext = do_GetInterface(docShell);
   }
   loadContext.forget(aLoadContext);
   return NS_OK;
 }

The Tor Browser / annotate

content/base/src/nsFrameLoader.cpp@6474c204b198 (annotated)

content/base/src/nsFrameLoader.cpp