Re-land: gpu: Add CHROMIUM_sync_query extension.

gpu/command_buffer/service/query_manager.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_
 
 #include <deque>
 #include <vector>
 #include "base/atomicops.h"
@@ skipping 201 matching lines @@
 
   // Returns a target used for the underlying GL extension
   // used to emulate a query.
   GLenum AdjustTargetForEmulation(GLenum target);
 
   // Used to validate shared memory and get GL errors.
   GLES2Decoder* decoder_;
 
   bool use_arb_occlusion_query2_for_occlusion_query_boolean_;
   bool use_arb_occlusion_query_for_occlusion_query_boolean_;
+  bool use_arb_sync_;
 
   // Counts the number of Queries allocated with 'this' as their manager.
   // Allows checking no Query will outlive this.
   unsigned query_count_;
 
   // Info for each query in the system.
   typedef base::hash_map<GLuint, scoped_refptr<Query> > QueryMap;
   QueryMap queries_;
 
   // Queries waiting for completion.
   typedef std::deque<scoped_refptr<Query> > QueryQueue;
   QueryQueue pending_queries_;
 
   // Async pixel transfer queries waiting for completion.
   QueryQueue pending_transfer_queries_;
 
   DISALLOW_COPY_AND_ASSIGN(QueryManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_