cc: add rasterize time to continuous painting graph data in impl-side-painting

cc/paint_time_counter.cc

 // Copyright 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.
 
 #include "cc/paint_time_counter.h"
 
 namespace cc {
 
 // static
 scoped_ptr<PaintTimeCounter> PaintTimeCounter::create() {
   return make_scoped_ptr(new PaintTimeCounter());
 }
 
-PaintTimeCounter::PaintTimeCounter() {
+PaintTimeCounter::PaintTimeCounter()
+  : last_frame_number(-2) {
 }
 
 base::TimeDelta PaintTimeCounter::GetPaintTimeOfRecentFrame(
     const size_t& n) const {
   DCHECK(n < ring_buffer_.BufferSize());
 
   if (ring_buffer_.IsFilledIndex(n))
     return ring_buffer_.ReadBuffer(n);
 
   return base::TimeDelta();
 }
 
-void PaintTimeCounter::SavePaintTime(const base::TimeDelta& total_paint_time) {
+void PaintTimeCounter::SavePaintTime(const base::TimeDelta& total_paint_time,
+                                     const int& frame_number) {
   base::TimeDelta paint_time = total_paint_time - last_total_paint_time_;
 
-  if (paint_time.InMillisecondsF() > 0)
+  if (paint_time.InMillisecondsF() > 0 && frame_number == last_frame_number + 1)
     ring_buffer_.SaveToBuffer(paint_time);
 
   last_total_paint_time_ = total_paint_time;
+  last_frame_number = frame_number;
 }
 
 void PaintTimeCounter::GetMinAndMaxPaintTime(base::TimeDelta* min,
                                              base::TimeDelta* max) const {
   *min = base::TimeDelta::FromDays(1);
   *max = base::TimeDelta();
 
   for (size_t i = 0; i < ring_buffer_.BufferSize(); i++) {
     if (ring_buffer_.IsFilledIndex(i)) {
       base::TimeDelta paint_time = ring_buffer_.ReadBuffer(i);
 
       if (paint_time < *min)
         *min = paint_time;
       if (paint_time > *max)
         *max = paint_time;
     }
   }
 
   if (*min > *max)
     *min = *max;
 }
 
 }  // namespace cc