gpu: Add sync token dependencies to flush metadata.

gpu/command_buffer/tests/gl_manager.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/tests/gl_manager.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stddef.h>
@@ skipping 603 matching lines @@
         sync_point_manager_);
     sync_point_order_data_->BeginProcessingOrderNumber(order_num);
     if (!sync_point_client_->Wait(sync_token, callback))
       callback.Run();
     sync_point_order_data_->FinishProcessingOrderNumber(order_num);
   } else {
     callback.Run();
   }
 }
 
-bool GLManager::CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) {
+void GLManager::WaitSyncTokenHint(const gpu::SyncToken& sync_token) {}
+
+bool GLManager::CanWaitUnverifiedSyncToken(const gpu::SyncToken& sync_token) {
   return false;
 }
 
 }  // namespace gpu