MailboxSync: Imply fence with sync point

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index b1d149756780428994c821b625b16414eafc76fd..1a8cc1704829d371fe2c0128757c346e97436c0e 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -857,8 +857,6 @@ void GpuCommandBufferStub::AddSyncPoint(uint32 sync_point) {
 void GpuCommandBufferStub::OnRetireSyncPoint(uint32 sync_point) {
   DCHECK(!sync_points_.empty() && sync_points_.front() == sync_point);
   sync_points_.pop_front();
-  if (context_group_->mailbox_manager()->UsesSync() && MakeCurrent())
-    context_group_->mailbox_manager()->PushTextureUpdates();
   GpuChannelManager* manager = channel_->gpu_channel_manager();
   manager->sync_point_manager()->RetireSyncPoint(sync_point);
 }