Make sure send one WebTouchEvent ack per ui::TouchEvent

ui/events/gestures/motion_event_aura.h

Index: ui/events/gestures/motion_event_aura.h
diff --git a/ui/events/gestures/motion_event_aura.h b/ui/events/gestures/motion_event_aura.h
index a094c03c9113e188e7b0239655f928931163273d..54636fb880657e74360ce8e91ddae8391db3af68 100644
--- a/ui/events/gestures/motion_event_aura.h
+++ b/ui/events/gestures/motion_event_aura.h
@@ -34,11 +34,12 @@ class EVENTS_EXPORT MotionEventAura : public MotionEventGeneric {
   // book-keeping.
   void CleanupRemovedTouchPoints(const TouchEvent& event);
 
+  int GetIndexFromId(int id) const;
+
  private:
   void AddTouch(const TouchEvent& touch);
   void UpdateTouch(const TouchEvent& touch);
   void UpdateCachedAction(const TouchEvent& touch);
-  int GetIndexFromId(int id) const;
 
   DISALLOW_COPY_AND_ASSIGN(MotionEventAura);
 };