Use MailboxManagerSync on android.

services/gles2/command_buffer_driver.cc

Index: services/gles2/command_buffer_driver.cc
diff --git a/services/gles2/command_buffer_driver.cc b/services/gles2/command_buffer_driver.cc
index 4720bf695165357f9b0dd7746131ccd36acc9950..1c3f9f62314fb0375bf5ed7d36e79b24e67a2508 100644
--- a/services/gles2/command_buffer_driver.cc
+++ b/services/gles2/command_buffer_driver.cc
@@ -236,6 +236,8 @@ void CommandBufferDriver::OnResize(gfx::Size size, float scale_factor) {
 bool CommandBufferDriver::OnWaitSyncPoint(uint32_t sync_point) {
   if (!sync_point)
     return true;
+  if (mailbox_manager_->UsesSync())
+    mailbox_manager_->PullTextureUpdates(sync_point);
   if (sync_point_manager_->IsSyncPointRetired(sync_point))
     return true;
   scheduler_->SetScheduled(false);
@@ -249,6 +251,12 @@ void CommandBufferDriver::OnSyncPointRetired() {
   scheduler_->SetScheduled(true);
 }
 
+void CommandBufferDriver::RetireSyncPointOnGpuThread(uint32 sync_point) {
+  if (mailbox_manager_->UsesSync())
+    mailbox_manager_->PushTextureUpdates(sync_point);
+  sync_point_manager_->RetireSyncPoint(sync_point);
+}
+
 void CommandBufferDriver::OnContextLost(uint32_t reason) {
   loss_observer_->DidLoseContext(reason);
   client_->DidLoseContext();