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

cc/paint_time_counter.cc

Index: cc/paint_time_counter.cc
diff --git a/cc/paint_time_counter.cc b/cc/paint_time_counter.cc
index 25b1bc677e9a7829cdf844a75d5c17588deeb5d4..14aa9cb569558aa7502932959c882aa77e9c2cda 100644
--- a/cc/paint_time_counter.cc
+++ b/cc/paint_time_counter.cc
@@ -11,7 +11,8 @@ scoped_ptr<PaintTimeCounter> PaintTimeCounter::create() {
   return make_scoped_ptr(new PaintTimeCounter());
 }
 
-PaintTimeCounter::PaintTimeCounter() {
+PaintTimeCounter::PaintTimeCounter()
+  : last_frame_number(-2) {
 }
 
 base::TimeDelta PaintTimeCounter::GetPaintTimeOfRecentFrame(
@@ -24,13 +25,15 @@ base::TimeDelta PaintTimeCounter::GetPaintTimeOfRecentFrame(
   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,