Use MailboxManagerSync on android.

services/gles2/mailbox_manager_factory.h

Index: services/gles2/mailbox_manager_factory.h
diff --git a/services/gles2/mailbox_manager_factory.h b/services/gles2/mailbox_manager_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..0411eefe27993e290736df4881edbedf5c081306
--- /dev/null
+++ b/services/gles2/mailbox_manager_factory.h
@@ -0,0 +1,19 @@
+// Copyright 2015 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 SERVICES_GLES2_MAILBOX_MANAGER_FACTORY_H_
+#define SERVICES_GLES2_MAILBOX_MANAGER_FACTORY_H_
+
+#include "gpu/command_buffer/service/mailbox_manager.h"
+
+namespace gles2 {
+
+class MailboxManagerFactory {
+ public:
+  static gpu::gles2::MailboxManager* Create();
+};
+
+}  // namespace gles2
+
+#endif  // SERVICES_GLES2_MAILBOX_MANAGER_FACTORY_H_