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

third_party/WebKit/Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 91 matching lines @@
 #include "wtf/CurrentTime.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 namespace {
 
 bool hasTouchHandlers(const EventHandlerRegistry& registry)
 {
-    return registry.hasEventHandlers(EventHandlerRegistry::TouchEventBlocking)
-        || registry.hasEventHandlers(EventHandlerRegistry::TouchEventPassive);
+    return registry.hasEventHandlers(EventHandlerRegistry::TouchStartOrMoveEventBlocking)
+        || registry.hasEventHandlers(EventHandlerRegistry::TouchStartOrMoveEventPassive)
+        || registry.hasEventHandlers(EventHandlerRegistry::TouchEndOrCancelEventBlocking)
+        || registry.hasEventHandlers(EventHandlerRegistry::TouchEndOrCancelEventPassive);
 }
 
 const AtomicString& touchEventNameForTouchPointState(PlatformTouchPoint::TouchState state)
 {
     switch (state) {
     case PlatformTouchPoint::TouchReleased:
         return EventTypeNames::touchend;
     case PlatformTouchPoint::TouchCancelled:
         return EventTypeNames::touchcancel;
     case PlatformTouchPoint::TouchPressed:
@@ skipping 3889 matching lines @@
 PlatformEvent::Modifiers EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return static_cast<PlatformEvent::Modifiers>(PlatformEvent::CtrlKey | PlatformEvent::AltKey);
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink