Added GPU Tracing for DoSwapBuffers() to track frames.

gpu/command_buffer/service/gpu_tracer.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.
 
 // This file contains the GPUTrace class.
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 
 #include <string>
 
@@ skipping 11 matching lines @@
 class Outputter;
 class GPUTrace;
 
 // Id used to keep trace namespaces separate
 enum GpuTracerSource {
   kTraceGroupInvalid = -1,
 
   kTraceGroupMarker = 0,
   kTraceCHROMIUM = 1,
   kTraceDecoder = 2,
+  kTraceSwapBuffer = 3,

[vmiura, 2015/01/16 20:39:34]

Should be OK to use kTraceDecoder.

[David Yen, 2015/01/16 21:34:19]

Done.

 
   NUM_TRACER_SOURCES
 };
 
 enum GpuTracerType {
   kTracerTypeInvalid = -1,
 
   kTracerTypeARBTimer,
   kTracerTypeDisjointTimer
 };
@@ skipping 168 matching lines @@
 
   GLuint queries_[2];
 
   DISALLOW_COPY_AND_ASSIGN(GPUTrace);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_