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

content/renderer/render_widget.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 "content/renderer/render_widget.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 688 matching lines @@
 }
 
 void RenderWidget::DoDeferredUpdateAndSendInputAck() {
   DoDeferredUpdate();
 
   if (pending_input_event_ack_.get())
     Send(pending_input_event_ack_.release());
 }
 
 void RenderWidget::DoDeferredUpdate() {
+  // Sanity check for tests:
+  TRACE_EVENT_INSTANT0("test_frame_rate_tests", "DoDeferredUpdate");
   TRACE_EVENT0("renderer", "RenderWidget::DoDeferredUpdate");
 
   if (!webwidget_)
     return;
   if (update_reply_pending()) {
     TRACE_EVENT0("renderer", "EarlyOut_UpdateReplyPending");
     return;
   }
   if (is_accelerated_compositing_active_ &&
       num_swapbuffers_complete_pending_ >= kMaxSwapBuffersPending) {
@@ skipping 756 matching lines @@
   }
 }
 
 bool RenderWidget::WillHandleMouseEvent(const WebKit::WebMouseEvent& event) {
   return false;
 }
 
 bool RenderWidget::WebWidgetHandlesCompositorScheduling() const {
   return false;
 }