Use thread with looper and native message loop for vsync service.

shell/android/android_handler.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 MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_
-#define MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_
+#ifndef SHELL_ANDROID_ANDROID_HANDLER_H_
+#define SHELL_ANDROID_ANDROID_HANDLER_H_
 
 #include <jni.h>
 
 #include "base/single_thread_task_runner.h"
 #include "mojo/application/content_handler_factory.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory_impl.h"
 #include "mojo/services/content_handler/interfaces/content_handler.mojom.h"
 #include "mojo/services/url_response_disk_cache/interfaces/url_response_disk_cache.mojom.h"
 
@@ skipping 29 matching lines @@
   mojo::URLResponseDiskCachePtr url_response_disk_cache_;
   scoped_refptr<base::SingleThreadTaskRunner> handler_task_runner_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(AndroidHandler);
 };
 
 bool RegisterAndroidHandlerJni(JNIEnv* env);
 
 }  // namespace shell
 
-#endif  // MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_
+#endif  // SHELL_ANDROID_ANDROID_HANDLER_H_