Add timestamps to synthesized events.

content/browser/renderer_host/input/synthetic_gesture.h

Index: content/browser/renderer_host/input/synthetic_gesture.h
diff --git a/content/browser/renderer_host/input/synthetic_gesture.h b/content/browser/renderer_host/input/synthetic_gesture.h
index c10c2fea2140dc39b9cfd23a231b7821b46e55c4..94524514c85219ce23f5308437d371c3cf92666a 100644
--- a/content/browser/renderer_host/input/synthetic_gesture.h
+++ b/content/browser/renderer_host/input/synthetic_gesture.h
@@ -46,9 +46,11 @@ class CONTENT_EXPORT SyntheticGesture {
   // platform. This function is called repeatedly by the synthetic gesture
   // controller until it stops returning GESTURE_RUNNING.
   virtual Result ForwardInputEvents(
-      const base::TimeDelta& interval, SyntheticGestureTarget* target) = 0;
+      const base::TimeTicks& timestamp, SyntheticGestureTarget* target) = 0;
+
+ protected:
+  static double ConvertTimestampToSeconds(const base::TimeTicks& timestamp);
 
- private:
   DISALLOW_COPY_AND_ASSIGN(SyntheticGesture);
 };