diff -r 000000000000 -r 6474c204b198 dom/ipc/TabMessageUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/ipc/TabMessageUtils.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* -*- 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/EventDispatcher.h"
+#include "mozilla/dom/TabMessageUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIDOMEvent.h"
+
+namespace mozilla {
+namespace dom {
+
+bool
+ReadRemoteEvent(const IPC::Message* aMsg, void** aIter,
+                RemoteDOMEvent* aResult)
+{
+  aResult->mEvent = nullptr;
+  nsString type;
+  NS_ENSURE_TRUE(ReadParam(aMsg, aIter, &type), false);
+
+  nsCOMPtr<nsIDOMEvent> event;
+  EventDispatcher::CreateEvent(nullptr, nullptr, nullptr, type,
+                               getter_AddRefs(event));
+  aResult->mEvent = do_QueryInterface(event);
+  NS_ENSURE_TRUE(aResult->mEvent, false);
+
+  return aResult->mEvent->Deserialize(aMsg, aIter);
+}
+
+}
+}