Ignore TouchCancel ack dispositions

content/common/input/web_input_event_traits.cc

 // 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.
 
 #include "content/common/input/web_input_event_traits.h"
 
 #include "base/logging.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
@@ skipping 271 matching lines @@
   DCHECK(event);
   Apply(WebInputEventCoalesce(), event->type, event_to_coalesce, event);
 }
 
 bool WebInputEventTraits::IgnoresAckDisposition(
     blink::WebInputEvent::Type type) {
   return type == WebInputEvent::GestureTapDown ||
       type == WebInputEvent::GestureShowPress ||
       type == WebInputEvent::GestureTapCancel ||
       type == WebInputEvent::GesturePinchBegin ||
-      type == WebInputEvent::GesturePinchEnd;
+      type == WebInputEvent::GesturePinchEnd ||
+      type == WebInputEvent::TouchCancel;
 }
 
 }  // namespace content