Support InputRouter recycling

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 85 matching lines @@
 
   // 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();
 
   void ForwardGestureEvent(const GestureEventWithLatencyInfo& gesture_event);
 
+  // Reset the state of the queue, dropping all pending gestures and preparing
+  // for an entirely new event stream.
+  void Recycle();
+
   // 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_interval_time_ms_for_testing(int interval_ms) {
     debounce_interval_ = base::TimeDelta::FromMilliseconds(interval_ms);
@@ skipping 105 matching lines @@
   // Time window in which to debounce scroll/fling ends. Note that an interval
   // of zero effectively disables debouncing.
   base::TimeDelta debounce_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_QUEUE_H_