diff -r 000000000000 -r 6474c204b198 dom/events/AsyncEventDispatcher.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/events/AsyncEventDispatcher.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
+#include "mozilla/dom/EventTarget.h"
+#include "nsContentUtils.h"
+#include "nsIDOMEvent.h"
+
+namespace mozilla {
+
+using namespace dom;
+
+/******************************************************************************
+ * mozilla::AsyncEventDispatcher
+ ******************************************************************************/
+
+AsyncEventDispatcher::AsyncEventDispatcher(nsINode* aEventNode,
+                                           WidgetEvent& aEvent)
+  : mEventNode(aEventNode)
+  , mDispatchChromeOnly(false)
+{
+  MOZ_ASSERT(mEventNode);
+  EventDispatcher::CreateEvent(aEventNode, nullptr, &aEvent, EmptyString(),
+                               getter_AddRefs(mEvent));
+  NS_ASSERTION(mEvent, "Should never fail to create an event");
+  mEvent->DuplicatePrivateData();
+  mEvent->SetTrusted(aEvent.mFlags.mIsTrusted);
+}
+
+NS_IMETHODIMP
+AsyncEventDispatcher::Run()
+{
+  if (mEvent) {
+    if (mDispatchChromeOnly) {
+      MOZ_ASSERT(mEvent->InternalDOMEvent()->IsTrusted());
+
+      nsCOMPtr<nsIDocument> ownerDoc = mEventNode->OwnerDoc();
+      nsPIDOMWindow* window = ownerDoc->GetWindow();
+      if (!window) {
+        return NS_ERROR_INVALID_ARG;
+      }
+
+      nsCOMPtr<EventTarget> target = window->GetParentTarget();
+      if (!target) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      EventDispatcher::DispatchDOMEvent(target, nullptr, mEvent,
+                                        nullptr, nullptr);
+    } else {
+      nsCOMPtr<EventTarget> target = mEventNode.get();
+      bool defaultActionEnabled; // This is not used because the caller is async
+      target->DispatchEvent(mEvent, &defaultActionEnabled);
+    }
+  } else {
+    nsIDocument* doc = mEventNode->OwnerDoc();
+    if (mDispatchChromeOnly) {
+      nsContentUtils::DispatchChromeEvent(doc, mEventNode, mEventType,
+                                          mBubbles, false);
+    } else {
+      nsContentUtils::DispatchTrustedEvent(doc, mEventNode, mEventType,
+                                           mBubbles, false);
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult
+AsyncEventDispatcher::PostDOMEvent()
+{
+  return NS_DispatchToCurrentThread(this);
+}
+
+void
+AsyncEventDispatcher::RunDOMEventWhenSafe()
+{
+  nsContentUtils::AddScriptRunner(this);
+}
+
+/******************************************************************************
+ * mozilla::LoadBlockingAsyncEventDispatcher
+ ******************************************************************************/
+
+LoadBlockingAsyncEventDispatcher::~LoadBlockingAsyncEventDispatcher()
+{
+  if (mBlockedDoc) {
+    mBlockedDoc->UnblockOnload(true);
+  }
+}
+
+} // namespace mozilla