Ensure Multi-finger tap generates both GestureScrollBegin and GestureScrollEnd.

ui/events/gestures/gesture_sequence.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_GESTURES_GESTURE_SEQUENCE_H_
 #define UI_EVENTS_GESTURES_GESTURE_SEQUENCE_H_
 
 #include "base/timer/timer.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/gestures/gesture_point.h"
@@ skipping 189 matching lines @@
   bool MaybeSwipe(const TouchEvent& event,
                   const GesturePoint& point,
                   Gestures* gestures);
 
   void TwoFingerTapOrPinch(const TouchEvent& event,
                            const GesturePoint& point,
                            Gestures* gestures);
 
   void StopTimersIfRequired(const TouchEvent& event);
 
+  void StartRailFreeScroll(const GesturePoint& point, Gestures* gestures);
+
   // Current state of gesture recognizer.
   GestureState state_;
 
   // ui::EventFlags.
   int flags_;
 
   // We maintain the smallest axis-aligned rectangle that contains all the
   // current touch-points. This box is updated after every touch-event.
   gfx::RectF bounding_box_;
 
@@ skipping 30 matching lines @@
   gfx::PointF last_touch_location_;
 
   GestureSequenceDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureSequence);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_SEQUENCE_H_