Expose scroll customization for touch to JS (behind REF).

Source/core/page/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 206 matching lines @@
 
     bool handlePasteGlobalSelection(const PlatformMouseEvent&);
 
     HitTestRequest::HitTestRequestType getHitTypeForGestureType(PlatformEvent::Type);
     void applyTouchAdjustment(PlatformGestureEvent*, HitTestResult*);
     bool handleGestureTap(const GestureEventWithHitTestResults&);
     bool handleGestureLongPress(const GestureEventWithHitTestResults&);
     bool handleGestureLongTap(const GestureEventWithHitTestResults&);
     bool handleGestureScrollUpdate(const PlatformGestureEvent&);
     bool handleGestureScrollBegin(const PlatformGestureEvent&);
-    void clearGestureScrollNodes();
+    void clearGestureScrollState();
 
     bool shouldApplyTouchAdjustment(const PlatformGestureEvent&) const;
 
     OptionalCursor selectCursor(const HitTestResult&);
     OptionalCursor selectAutoCursor(const HitTestResult&, Node*, const Cursor& iBeam);
 
     void hoverTimerFired(Timer<EventHandler>*);
     void cursorUpdateTimerFired(Timer<EventHandler>*);
     void activeIntervalTimerFired(Timer<EventHandler>*);
 
@@ skipping 178 matching lines @@
     // scroll sequence in this frame, or any child frames. Only used
     // with ScrollCustomization. If some delta has been consumed, a
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 #endif // EventHandler_h