diff -r 000000000000 -r 6474c204b198 xpcom/base/nsMessageLoop.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsMessageLoop.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* -*- 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 "nsIMessageLoop.h"
+
+/*
+ * nsMessageLoop implements nsIMessageLoop, which wraps Chromium's MessageLoop
+ * class and adds a bit of sugar.
+ */
+class nsMessageLoop : public nsIMessageLoop
+{
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMESSAGELOOP
+
+  virtual ~nsMessageLoop() {}
+};
+
+#define NS_MESSAGE_LOOP_CID \
+{0x67b3ac0c, 0xd806, 0x4d48, \
+{0x93, 0x9e, 0x6a, 0x81, 0x9e, 0x6c, 0x24, 0x8f}}
+
+extern nsresult
+nsMessageLoopConstructor(nsISupports* outer,
+                         const nsIID& aIID,
+                         void* *aInstancePtr);