Don't pass touches to gesture recognizer for async acks.

ui/events/gestures/gesture_recognizer.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_RECOGNIZER_H_
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
@@ skipping 16 matching lines @@
 
   virtual ~GestureRecognizer() {}
 
   // Invoked before event dispatch. If the event is invalid given the current
   // touch sequence, returns false.
   virtual bool ProcessTouchEventPreDispatch(TouchEvent* event,
                                             GestureConsumer* consumer) = 0;
 
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Acks the first gesture packet in the queue.
-  virtual Gestures* AckAsyncTouchEvent(
-      const TouchEvent& event,
-      ui::EventResult result,
-      GestureConsumer* consumer) = 0;
+  virtual Gestures* AckAsyncTouchEvent(ui::EventResult result,
+                                       GestureConsumer* consumer) = 0;
 
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Acks the last gesture packet in the queue.
   virtual Gestures* AckSyncTouchEvent(const uint64 unique_event_id,
                                       ui::EventResult result,
                                       GestureConsumer* consumer) = 0;
 
   // This is called when the consumer is destroyed. So this should cleanup any
   // internal state maintained for |consumer|. Returns true iff there was
   // state relating to |consumer| to clean up.
@@ skipping 43 matching lines @@
 
   // Unsubscribes |helper| from async gesture dispatch.
   // Since the GestureRecognizer does not own the |helper|, it is not deleted
   // and must be cleaned up appropriately by the caller.
   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_