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

ui/aura/window_event_dispatcher.h

 // Copyright 2014 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_AURA_WINDOW_EVENT_DISPATCHER_H_
 #define UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 74 matching lines @@
 
   // Gesture Recognition -------------------------------------------------------
 
   // When a touch event is dispatched to a Window, it may want to process the
   // touch event asynchronously. In such cases, the window should consume the
   // event during the event dispatch. Once the event is properly processed, the
   // window should let the WindowEventDispatcher know about the result of the
   // event processing, so that gesture events can be properly created and
   // dispatched. |event|'s location should be in the dispatcher's coordinate
   // space, in DIPs.
-  void ProcessedTouchEvent(ui::TouchEvent* event,
-                           Window* window,
-                           ui::EventResult result);
+  virtual void ProcessedTouchEvent(Window* window, ui::EventResult result);
 
   // These methods are used to defer the processing of mouse/touch events
   // related to resize. A client (typically a RenderWidgetHostViewAura) can call
   // HoldPointerMoves when an resize is initiated and then ReleasePointerMoves
   // once the resize is completed.
   //
   // More than one hold can be invoked and each hold must be cancelled by a
   // release before we resume normal operation.
   void HoldPointerMoves();
   void ReleasePointerMoves();
@@ skipping 159 matching lines @@
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<WindowEventDispatcher> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowEventDispatcher);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_EVENT_DISPATCHER_H_