diff -r 000000000000 -r 6474c204b198 dom/events/MessageEvent.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/events/MessageEvent.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,90 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_MessageEvent_h_
+#define mozilla_dom_MessageEvent_h_
+
+#include "mozilla/dom/Event.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIDOMMessageEvent.h"
+#include "mozilla/dom/MessagePortList.h"
+
+namespace mozilla {
+namespace dom {
+
+class MessageEventInit;
+class MessagePort;
+class MessagePortBase;
+class MessagePortList;
+class OwningWindowProxyOrMessagePort;
+
+/**
+ * Implements the MessageEvent event, used for cross-document messaging and
+ * server-sent events.
+ *
+ * See http://www.whatwg.org/specs/web-apps/current-work/#messageevent for
+ * further details.
+ */
+class MessageEvent : public Event,
+                     public nsIDOMMessageEvent
+{
+public:
+  MessageEvent(EventTarget* aOwner,
+               nsPresContext* aPresContext,
+               WidgetEvent* aEvent);
+  ~MessageEvent();
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(MessageEvent, Event)
+
+  NS_DECL_NSIDOMMESSAGEEVENT
+
+  // Forward to base class
+  NS_FORWARD_TO_EVENT
+
+  virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
+
+  void GetData(JSContext* aCx, JS::MutableHandle<JS::Value> aData,
+               ErrorResult& aRv);
+
+  void GetSource(Nullable<OwningWindowProxyOrMessagePort>& aValue) const;
+
+  MessagePortList* GetPorts()
+  {
+    return mPorts;
+  }
+
+  void SetPorts(MessagePortList* aPorts);
+
+  // Non WebIDL methods
+  void SetSource(mozilla::dom::MessagePort* aPort)
+  {
+    mPortSource = aPort;
+  }
+
+  void SetSource(nsPIDOMWindow* aWindow)
+  {
+    mWindowSource = aWindow;
+  }
+
+  static already_AddRefed<MessageEvent>
+  Constructor(const GlobalObject& aGlobal, JSContext* aCx,
+              const nsAString& aType,
+              const MessageEventInit& aEventInit,
+              ErrorResult& aRv);
+
+private:
+  JS::Heap<JS::Value> mData;
+  nsString mOrigin;
+  nsString mLastEventId;
+  nsCOMPtr<nsIDOMWindow> mWindowSource;
+  nsRefPtr<MessagePortBase> mPortSource;
+  nsRefPtr<MessagePortList> mPorts;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_MessageEvent_h_