Non passive touch end or touch cancel listeners should not block scroll.

third_party/WebKit/Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 178 matching lines @@
 
     virtual void attachCompositorAnimationTimeline(CompositorAnimationTimeline*, LocalFrame* localRoot) { }
     virtual void detachCompositorAnimationTimeline(CompositorAnimationTimeline*, LocalFrame* localRoot) { }
 
     virtual void enterFullScreenForElement(Element*) { }
     virtual void exitFullScreenForElement(Element*) { }
 
     virtual void clearCompositedSelection() { }
     virtual void updateCompositedSelection(const CompositedSelection&) { }
 
+    virtual void setHaveTouchEventListeners(bool) = 0;

[tdresser, 2016/04/13 16:52:35]

setHas

[dtapuska, 2016/04/13 18:00:15]

Done.

     virtual void setEventListenerProperties(WebEventListenerClass, WebEventListenerProperties) = 0;
     virtual WebEventListenerProperties eventListenerProperties(WebEventListenerClass) const = 0;
     virtual void setHaveScrollEventHandlers(bool) = 0;
     virtual bool haveScrollEventHandlers() const = 0;
 
     virtual void setTouchAction(TouchAction) = 0;
 
     // Checks if there is an opened popup, called by LayoutMenuList::showPopup().
     virtual bool hasOpenedPopup() const = 0;
     virtual PopupMenu* openPopupMenu(LocalFrame&, HTMLSelectElement&) = 0;
@@ skipping 69 matching lines @@
 
     LayoutPoint m_lastToolTipPoint;
     String m_lastToolTipText;
 
     FRIEND_TEST_ALL_PREFIXES(ChromeClientTest, SetToolTipFlood);
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h