diff -r 000000000000 -r 6474c204b198 dom/base/MessagePortList.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/base/MessagePortList.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "MessagePortList.h"
+#include "mozilla/dom/MessagePortListBinding.h"
+#include "mozilla/dom/MessagePort.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_2(MessagePortList, mOwner, mPorts)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(MessagePortList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(MessagePortList)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MessagePortList)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject*
+MessagePortList::WrapObject(JSContext* aCx)
+{
+  return MessagePortListBinding::Wrap(aCx, this);
+}
+
+} // namespace dom
+} // namespace mozilla