Use MailboxManagerSync on android.

services/gles2/mailbox_manager_factory_sync.cc

Index: services/gles2/mailbox_manager_factory_sync.cc
diff --git a/services/gles2/mailbox_manager_factory_sync.cc b/services/gles2/mailbox_manager_factory_sync.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c3ec95f8bf2443085fdaa83d56fbdac7ef57bc0b
--- /dev/null
+++ b/services/gles2/mailbox_manager_factory_sync.cc
@@ -0,0 +1,16 @@
+// 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.
+//
+
+#include "services/gles2/mailbox_manager_factory.h"
+
+#include "gpu/command_buffer/service/mailbox_manager_sync.h"
+
+namespace gles2 {
+
+gpu::gles2::MailboxManager* MailboxManagerFactory::Create() {
+  return new gpu::gles2::MailboxManagerSync;

[jamesr, 2015/09/18 02:31:35]

instead of having separate _sync and _nosync.cc we could just have one with an
#if defined(OS_ANDROID). i think policy decisions made in code tend to be easier
for developers to find than policy decisions made in the build system

[cdotstout, 2015/09/18 15:51:40]

Done.

+}
+
+}  // namespace gles2