Clear pending events upon main frame navigation

content/browser/renderer_host/input/touch_event_queue.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_TOUCH_EVENT_QUEUE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 88 matching lines @@
   // resume the normal flow of sending touch events to the renderer.
   void OnGestureScrollEvent(const GestureEventWithLatencyInfo& gesture_event);
 
   void OnGestureEventAck(
       const GestureEventWithLatencyInfo& event,
       InputEventAckState ack_result);
 
   // Notifies the queue whether the renderer has at least one touch handler.
   void OnHasTouchEventHandlers(bool has_handlers);
 
+  // Empties the queue of touch events, ack'ing each in turn with |ack_state|.
+  // This may result in any number of gesture events being sent to the renderer.
+  void Flush(InputEventAckState flush_ack);
+
   // Returns whether the currently pending touch event (waiting ACK) is for
   // a touch start event.
   bool IsPendingAckTouchStart() const;
 
   // Sets whether a delayed touch ack will cancel and flush the current
   // touch sequence. Note that, if the timeout was previously disabled, enabling
   // it will take effect only for the following touch sequence.
   void SetAckTimeoutEnabled(bool enabled);
 
   bool IsAckTimeoutEnabled() const;
@@ skipping 13 matching lines @@
  private:
   class TouchTimeoutHandler;
   class TouchMoveSlopSuppressor;
   friend class TouchTimeoutHandler;
   friend class TouchEventQueueTest;
 
   bool HasPendingAsyncTouchMoveForTesting() const;
   bool IsTimeoutRunningForTesting() const;
   const TouchEventWithLatencyInfo& GetLatestEventForTesting() const;
 
-  // Empties the queue of touch events. This may result in any number of gesture
-  // events being sent to the renderer.
-  void FlushQueue();
-
   // Walks the queue, checking each event with |FilterBeforeForwarding()|.
   // If allowed, forwards the touch event and stops processing further events.
   // Otherwise, acks the event with |INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS|.
   void TryForwardNextEventToRenderer();
 
   // Forwards the event at the head of the queue to the renderer.
   void ForwardNextEventToRenderer();
 
   // Pops the touch-event from the head of the queue and acks it to the client.
   void PopTouchEventToClient(InputEventAckState ack_result);
@@ skipping 84 matching lines @@
   // setting for experimentation, but we may evolve it into an app-controlled
   // mode.
   const TouchScrollingMode touch_scrolling_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_