Don't send touch move to renderer while scrolling

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 42 matching lines @@
 
   // Empties the queue of touch events. This may result in any number of gesture
   // events being sent to the renderer.
   void FlushQueue();
 
   // Returns whether the event-queue is empty.
   bool empty() const WARN_UNUSED_RESULT {
     return touch_queue_.empty();
   }
 
+  void set_no_touch_move_to_renderer(bool value) {
+    no_touch_move_to_renderer_ = value;
+  }
+
  private:
   friend class MockRenderWidgetHost;
   friend class ImmediateInputRouterTest;
 
   CONTENT_EXPORT size_t GetQueueSize() const;
   CONTENT_EXPORT const TouchEventWithLatencyInfo& GetLatestEvent() const;
 
   // Pops the touch-event from the top of the queue and sends it to the
   // TouchEventQueueClient. This reduces the size of the queue by one.
   void PopTouchEventWithAck(InputEventAckState ack_result);
 
   bool ShouldForwardToRenderer(const WebKit::WebTouchEvent& event) const;
 
   // Handles touch event forwarding and ack'ed event dispatch.
   TouchEventQueueClient* client_;
 
   typedef std::deque<CoalescedWebTouchEvent*> TouchQueue;
   TouchQueue touch_queue_;
 
   // Maintain the ACK status for each touch point.
   typedef std::map<int, InputEventAckState> TouchPointAckStates;
   TouchPointAckStates touch_ack_states_;
 
   // Used to defer touch forwarding when ack dispatch triggers |QueueEvent()|.
   bool dispatching_touch_ack_;
 
+  // Don't send touch move events to renderer. This is enabled when the page
+  // is scrolling.

[sadrul, 2013/08/13 19:40:04]

+ "This behaviour is currently enabled only on aura behind a flag."

[Yufeng Shen (Slow to review), 2013/08/13 20:17:27]

Done.

+  bool no_touch_move_to_renderer_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_