Added support for Time Elapsed queries through the command buffer.

gpu/command_buffer/service/query_manager.h

Index: gpu/command_buffer/service/query_manager.h
diff --git a/gpu/command_buffer/service/query_manager.h b/gpu/command_buffer/service/query_manager.h
index 5f14929272c2c5ce77ee4c3c85606894cfce83f8..e453d03f818e3b99d54e7104749fabb3dea5e183 100644
--- a/gpu/command_buffer/service/query_manager.h
+++ b/gpu/command_buffer/service/query_manager.h
@@ -16,6 +16,11 @@
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/gpu_export.h"
 
+namespace gfx {
+  class GPUTimer;
+  class GPUTimingClient;
+}
+
 namespace gpu {
 
 class GLES2Decoder;
@@ -188,6 +193,9 @@ class GPU_EXPORT QueryManager {
     return decoder_;
   }
 
+  scoped_ptr<gfx::GPUTimer> CreateGPUTimer(bool elapsed_time);
+  bool GPUTimingAvailable();
+
   void GenQueries(GLsizei n, const GLuint* queries);
   bool IsValidQuery(GLuint id);
 
@@ -241,6 +249,9 @@ class GPU_EXPORT QueryManager {
   // 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);
 };