Defer synthetic gesture completions until events have been flushed

content/browser/renderer_host/input/synthetic_gesture_controller.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
 
 #include <queue>
 #include <utility>
 
@@ skipping 20 matching lines @@
 
   typedef base::Callback<void(SyntheticGesture::Result)>
       OnGestureCompleteCallback;
   void QueueSyntheticGesture(
       scoped_ptr<SyntheticGesture> synthetic_gesture,
       const OnGestureCompleteCallback& completion_callback);
 
   // Forward input events of the currently processed gesture.
   void Flush(base::TimeTicks timestamp);
 
+  // To be called when all events generated from the current gesture have been
+  // fully flushed from the input pipeline (i.e., sent, processed and ack'ed).
+  void OnDidFlushInput();
+
  private:
   void StartGesture(const SyntheticGesture& gesture);
   void StopGesture(const SyntheticGesture& gesture,
                    const OnGestureCompleteCallback& completion_callback,
                    SyntheticGesture::Result result);
 
   scoped_ptr<SyntheticGestureTarget> gesture_target_;
+  scoped_ptr<SyntheticGesture::Result> pending_gesture_result_;
 
   // A queue of gesture/callback pairs.  Implemented as two queues to
   // simplify the ownership of SyntheticGesture pointers.
   class GestureAndCallbackQueue {
   public:
     GestureAndCallbackQueue();
     ~GestureAndCallbackQueue();
     void Push(scoped_ptr<SyntheticGesture> gesture,
         const OnGestureCompleteCallback& callback) {
       gestures_.push_back(gesture.release());
@@ skipping 17 matching lines @@
     ScopedVector<SyntheticGesture> gestures_;
     std::queue<OnGestureCompleteCallback> callbacks_;
   } pending_gesture_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticGestureController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_