Drag and drop cleans up touch sequences from the source window.

ui/events/gestures/gesture_types.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_TYPES_H_
 #define UI_EVENTS_GESTURES_GESTURE_TYPES_H_
 
 #include "ui/events/events_export.h"
 
 namespace ui {
@@ skipping 12 matching lines @@
 // can dispatch them.
 class EVENTS_EXPORT GestureEventHelper {
  public:
   virtual ~GestureEventHelper() {
   }
 
   // Returns true if this helper can dispatch events to |consumer|.
   virtual bool CanDispatchToConsumer(GestureConsumer* consumer) = 0;
   virtual void DispatchGestureEvent(GestureConsumer* raw_input_consumer,
                                     GestureEvent* event) = 0;
-  virtual void DispatchCancelTouchEvent(GestureConsumer* raw_input_consumer,
-                                        TouchEvent* event) = 0;
+  virtual void DispatchSyntheticTouchEvent(TouchEvent* event) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_TYPES_H_