add "did it run on GPU" check to frame_rate_tests.cc using AutomationProxy tracing feature

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2011 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/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 6990 matching lines @@
   }
   // TODO(gman): call glShaderBinary
   return error::kNoError;
 #endif
 }
 
 error::Error GLES2DecoderImpl::HandleSwapBuffers(
     uint32 immediate_data_size, const gles2::SwapBuffers& c) {
   bool is_offscreen = !!offscreen_target_frame_buffer_.get();
   int this_frame_number = frame_number_++;
+  // This event is used by frame_rate_tests:
+  TRACE_EVENT_INSTANT1("test_frame_rate_tests", "SwapBuffers",
+                       "GLImpl", static_cast<int>(gfx::GetGLImplementation()));
   TRACE_EVENT2("gpu", "GLES2DecoderImpl::HandleSwapBuffers",
                "offscreen", is_offscreen,
                "frame", this_frame_number);
   // If offscreen then don't actually SwapBuffers to the display. Just copy
   // the rendered frame to another frame buffer.
   if (is_offscreen) {
     if (offscreen_size_ != offscreen_saved_color_texture_->size()) {
       // Workaround for NVIDIA driver bug on OS X; crbug.com/89557,
       // crbug.com/94163. TODO(kbr): figure out reproduction so Apple will
       // fix this.
@@ skipping 384 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu