Add GestureTapCancel gesture type

ui/base/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_BASE_GESTURES_GESTURE_SEQUENCE_H_
 #define UI_BASE_GESTURES_GESTURE_SEQUENCE_H_
 
 #include "base/timer.h"
 #include "ui/base/events/event_constants.h"
 #include "ui/base/gestures/gesture_point.h"
@@ skipping 68 matching lines @@
   GestureEvent* CreateGestureEvent(const GestureEventDetails& details,
                                    const gfx::Point& location,
                                    int flags,
                                    base::Time timestamp,
                                    unsigned int touch_id_bitmask);
 
   // Functions to be called to add GestureEvents, after successful recognition.
 
   // Tap gestures.
   void AppendTapDownGestureEvent(const GesturePoint& point, Gestures* gestures);
+  void PrependTapCancelGestureEvent(const GesturePoint& point,
+                                   Gestures* gestures);
   void AppendBeginGestureEvent(const GesturePoint& point, Gestures* gestures);
   void AppendEndGestureEvent(const GesturePoint& point, Gestures* gestures);
   void AppendClickGestureEvent(const GesturePoint& point,
                                int tap_count,
                                Gestures* gestures);
   void AppendDoubleClickGestureEvent(const GesturePoint& point,
                                      Gestures* gestures);
   void AppendLongPressGestureEvent();
 
   // Scroll gestures.
@@ skipping 108 matching lines @@
   gfx::Point last_touch_location_;
 
   GestureEventHelper* helper_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureSequence);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_SEQUENCE_H_