Defer synthetic gesture completions until events have been flushed

content/browser/renderer_host/input/gesture_event_queue.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 CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 68 matching lines @@
                          blink::WebInputEvent::Type type,
                          const ui::LatencyInfo& latency);
 
   // Sets the state of the |fling_in_progress_| field to indicate that a fling
   // is definitely not in progress.
   void FlingHasBeenHalted();
 
   // Returns the |TouchpadTapSuppressionController| instance.
   TouchpadTapSuppressionController* GetTouchpadTapSuppressionController();
 
-  // Returns whether there are any gesture event in the queue.
-  bool HasQueuedGestureEvents() const;
+  void ForwardGestureEvent(const GestureEventWithLatencyInfo& gesture_event);
 
-  void ForwardGestureEvent(const GestureEventWithLatencyInfo& gesture_event);
+  // Whether the queue is expecting a gesture event ack.
+  bool ExpectingGestureAck() const;
+
+  bool empty() const {
+    return coalesced_gesture_events_.empty() &&
+           debouncing_deferral_queue_.empty();
+  }
 
   void set_debounce_enabled_for_testing(bool enabled) {
     debounce_enabled_ = enabled;
   }
 
   void set_debounce_interval_time_ms_for_testing(int interval_time_ms) {
     debounce_interval_time_ms_ = interval_time_ms;
   }
 
  private:
@@ skipping 116 matching lines @@
   // Whether scroll-ending events should be deferred when a scroll is active.
   // Defaults to true.
   bool debounce_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_