MailboxSync: Imply fence with sync point

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 1bc8aad5bbfe5a929bfec74db8d7c9283fa8c131..0b8d68d80f362255cdd347cf5335a116dd0ed0b9 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -9746,11 +9746,11 @@ error::Error GLES2DecoderImpl::HandleWaitSyncPointCHROMIUM(
     const void* cmd_data) {
   const gles2::cmds::WaitSyncPointCHROMIUM& c =
       *static_cast<const gles2::cmds::WaitSyncPointCHROMIUM*>(cmd_data);
-  group_->mailbox_manager()->PullTextureUpdates();
+  uint32 sync_point = c.sync_point;
   if (wait_sync_point_callback_.is_null())
     return error::kNoError;
 
-  return wait_sync_point_callback_.Run(c.sync_point) ?
+  return wait_sync_point_callback_.Run(sync_point) ?
       error::kNoError : error::kDeferCommandUntilLater;
 }