[Chromecast] Add IPC code on brower process side

chromecast/browser/media/cma_message_loop.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMECAST_BROWSER_MEDIA_CMA_MESSAGE_LOOP_H_
+#define CHROMECAST_BROWSER_MEDIA_CMA_MESSAGE_LOOP_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/singleton.h"
+
+namespace base {
+class MessageLoopProxy;
+class Thread;
+}
+
+namespace chromecast {
+namespace media {
+
+class CmaMessageLoop {
+ public:
+  static scoped_refptr<base::MessageLoopProxy> GetMessageLoopProxy();
+
+ private:
+  friend struct DefaultSingletonTraits<CmaMessageLoop>;
+  friend class Singleton<CmaMessageLoop>;
+
+  static CmaMessageLoop* GetInstance();
+
+  CmaMessageLoop();
+  ~CmaMessageLoop();
+
+  scoped_ptr<base::Thread> thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(CmaMessageLoop);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_BROWSER_MEDIA_CMA_MESSAGE_LOOP_H_