Generate tap gesture with tap_count = 3 for triple-tap

ui/base/gestures/gesture_point.h

Index: ui/base/gestures/gesture_point.h
diff --git a/ui/base/gestures/gesture_point.h b/ui/base/gestures/gesture_point.h
index f52fece40ac0dbdc5d68dfc72d79836c4a1ef228..8dbee7a2b58eb73925fe0713d03c6480ff5ed652 100644
--- a/ui/base/gestures/gesture_point.h
+++ b/ui/base/gestures/gesture_point.h
@@ -39,6 +39,7 @@ class GesturePoint {
   // represent a click or scroll etc.)
   bool IsInClickWindow(const TouchEvent& event) const;
   bool IsInDoubleClickWindow(const TouchEvent& event) const;
+  bool IsInTripleClickWindow(const TouchEvent& event) const;
   bool IsInScrollWindow(const TouchEvent& event) const;
   bool IsInFlickWindow(const TouchEvent& event);
   bool IsInHorizontalRailWindow() const;
@@ -86,7 +87,9 @@ class GesturePoint {
   // Various statistical functions to manipulate gestures.
   bool IsInClickTimeWindow() const;
   bool IsInSecondClickTimeWindow() const;
+  bool IsInThirdClickTimeWindow() const;
   bool IsSecondClickInsideManhattanSquare(const TouchEvent& event) const;
+  bool IsThirdClickInsideManhattanSquare(const TouchEvent& event) const;
   bool IsOverMinFlickSpeed();
 
   // Returns -1, 0, 1 for |v| below the negative velocity threshold,
@@ -112,6 +115,9 @@ class GesturePoint {
   gfx::Point last_touch_position_;
   double last_touch_time_;
 
+  double second_last_tap_time_;
+  gfx::Point second_last_tap_position_;
+
   double last_tap_time_;
   gfx::Point last_tap_position_;