diff -r 000000000000 -r 6474c204b198 ipc/glue/IOThreadChild.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/glue/IOThreadChild.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=2 et :
+ * 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 dom_plugins_IOThreadChild_h
+#define dom_plugins_IOThreadChild_h 1
+
+#include "chrome/common/child_thread.h"
+
+namespace mozilla {
+namespace ipc {
+//-----------------------------------------------------------------------------
+
+// The IOThreadChild class represents a background thread where the
+// IPC IO MessageLoop lives.
+class IOThreadChild : public ChildThread {
+public:
+  IOThreadChild()
+    : ChildThread(base::Thread::Options(MessageLoop::TYPE_IO,
+                                        0)) // stack size
+  { }
+
+  ~IOThreadChild()
+  { }
+
+  static MessageLoop* message_loop() {
+    return IOThreadChild::current()->Thread::message_loop();
+  }
+
+  // IOThreadChild owns the returned IPC::Channel.
+  static IPC::Channel* channel() {
+    return IOThreadChild::current()->ChildThread::channel();
+  }
+
+protected:
+  static IOThreadChild* current() {
+    return static_cast<IOThreadChild*>(ChildThread::current());
+  }
+
+private:
+  DISALLOW_EVIL_CONSTRUCTORS(IOThreadChild);
+};
+
+}  // namespace plugins
+}  // namespace mozilla
+
+#endif  // ifndef dom_plugins_IOThreadChild_h