Add latency measurement system

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 1a2324f1cf2a7d8d37490eea0b1a2e4738fbd697..3f7b1ea349a0e086afa922269d1d9360d75d8f43 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -210,6 +210,8 @@ class COMPOSITOR_EXPORT Compositor
   // the whole frame needs to be drawn.
   void ScheduleFullDraw();
 
+  int64 SetInputNumber(int64 input_number);
+
   // Reads the region |bounds_in_pixel| of the contents of the last rendered
   // frame into the given bitmap.
   // Returns false if the pixels could not be read.
@@ -263,7 +265,8 @@ class COMPOSITOR_EXPORT Compositor
   virtual void didCompleteSwapBuffers() OVERRIDE;
   virtual void scheduleComposite() OVERRIDE;
   virtual scoped_ptr<cc::FontAtlas> createFontAtlas() OVERRIDE;
-
+  virtual void onReceivedLatencyInfo(
+    const WebKit::WebLatencyInfoImpl& latencyInfo) OVERRIDE;
 
   int last_started_frame() { return last_started_frame_; }
   int last_ended_frame() { return last_ended_frame_; }
@@ -305,6 +308,8 @@ class COMPOSITOR_EXPORT Compositor
   int last_started_frame_;
   int last_ended_frame_;
 
+  int64 frame_number_;
+
   bool disable_schedule_composite_;
 
   CompositorLock* compositor_lock_;