Added support for Time Elapsed queries through the command buffer.

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"
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/gpu_export.h"
 
+namespace gfx {
+  class GPUTimer;
+  class GPUTimingClient;
+}
+
 namespace gpu {
 
 class GLES2Decoder;
 
 namespace gles2 {
 
 class FeatureInfo;
 
 // This class keeps track of the queries and their state
 // As Queries are not shared there is one QueryManager per context.
@@ skipping 152 matching lines @@
   // pointing to invalid shared memory.
   bool ProcessPendingTransferQueries();
 
   // True if there are pending transfer queries.
   bool HavePendingTransferQueries();
 
   GLES2Decoder* decoder() const {
     return decoder_;
   }
 
+  scoped_ptr<gfx::GPUTimer> CreateGPUTimer(bool elapsed_time);
+  bool GPUTimingAvailable();
+
   void GenQueries(GLsizei n, const GLuint* queries);
   bool IsValidQuery(GLuint id);
 
  private:
   void StartTracking(Query* query);
   void StopTracking(Query* query);
 
   // Wrappers for BeginQueryARB and EndQueryARB to hide differences between
   // ARB_occlusion_query2 and EXT_occlusion_query_boolean.
   void BeginQueryHelper(GLenum target, GLuint id);
@@ skipping 33 matching lines @@
   typedef base::hash_set<GLuint> GeneratedQueryIds;
   GeneratedQueryIds generated_query_ids_;
 
   // 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_;
 
+  // Used for timer queries.
+  scoped_refptr<gfx::GPUTimingClient> gpu_timing_client_;
+
   DISALLOW_COPY_AND_ASSIGN(QueryManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_QUERY_MANAGER_H_