Telemtry: hooks "chrome.gpuBenchmarking.smoothScrollBy" with java on android.

content/port/browser/smooth_scroll_gesture.h

Index: content/port/browser/smooth_scroll_gesture.h
diff --git a/content/port/browser/smooth_scroll_gesture.h b/content/port/browser/smooth_scroll_gesture.h
index 4e2c1d908f411e0e6d63b49c6e96798d7f86b665..3b7bec7675ae971bb6fb6325d5d8878f68971331 100644
--- a/content/port/browser/smooth_scroll_gesture.h
+++ b/content/port/browser/smooth_scroll_gesture.h
@@ -14,10 +14,9 @@ class RenderWidgetHost;
 
 // This is a base class representing a single scroll gesture. These gestures are
 // paired with the rendering benchmarking system to (automatically) measure how
-// smoothnly chrome is responding to user input.
+// smoothly chrome is responding to user input.
 class SmoothScrollGesture : public base::RefCounted<SmoothScrollGesture> {
  public:
-
   // When called, the gesture should compute its state at the provided timestamp
   // and send the right input events to the provided RenderWidgetHost to
   // simulate the gesture having run up to that point in time.
@@ -29,6 +28,11 @@ class SmoothScrollGesture : public base::RefCounted<SmoothScrollGesture> {
  protected:
   friend class base::RefCounted<SmoothScrollGesture>;
   virtual ~SmoothScrollGesture() {}
+
+  double Tick(base::TimeTicks now, double desired_interval_ms);
+
+ private:
+  base::TimeTicks last_tick_time_;
 };
 
 } // namespace content