Touch Events - changedTouches list includes non-changed touch points on Android

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 146 matching lines @@
 
   // Ack all coalesced events in |acked_event| to the client with |ack_result|,
   // updating the acked events with |optional_latency_info| if it exists.
   void AckTouchEventToClient(InputEventAckState ack_result,
                              scoped_ptr<CoalescedWebTouchEvent> acked_event,
                              const ui::LatencyInfo* optional_latency_info);
 
   // Safely pop the head of the queue.
   scoped_ptr<CoalescedWebTouchEvent> PopTouchEvent();
 
-  // Dispatch |touch| to the client.
-  void SendTouchEventImmediately(const TouchEventWithLatencyInfo& touch);
+  // Dispatch |touch| to the client. Before dispatching, updates pointer
+  // states in touchmove events for pointers that have not changed position.
+  void SendTouchEventImmediately(TouchEventWithLatencyInfo* touch);
 
   enum PreFilterResult {
     ACK_WITH_NO_CONSUMER_EXISTS,
     ACK_WITH_NOT_CONSUMED,
     FORWARD_TO_RENDERER,
   };
   // Filter touches prior to forwarding to the renderer, e.g., if the renderer
   // has no touch handler.
   PreFilterResult FilterBeforeForwarding(const blink::WebTouchEvent& event);
   void ForwardToRenderer(const TouchEventWithLatencyInfo& event);
@@ skipping 50 matching lines @@
   // For details see the design doc at http://goo.gl/lVyJAa.
   bool send_touch_events_async_;
   scoped_ptr<TouchEventWithLatencyInfo> pending_async_touchmove_;
   double last_sent_touch_timestamp_sec_;
 
   // How touch events are handled during scrolling.  For now this is a global
   // setting for experimentation, but we may evolve it into an app-controlled
   // mode.
   const TouchScrollingMode touch_scrolling_mode_;
 
+  // Event is saved to compare pointer positions for new touchmove events.
+  scoped_ptr<blink::WebTouchEvent> last_sent_touchevent_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_