Use scroll customization primitives for touch scrolling (behind REF).

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 Apple Inc. 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
@@ skipping 43 matching lines @@
 class ElementRareData;
 class ElementShadow;
 class ExceptionState;
 class Image;
 class InputMethodContext;
 class IntSize;
 class Locale;
 class MutableStylePropertySet;
 class PropertySetCSSStyleDeclaration;
 class PseudoElement;
+class ScrollState;
 class ScrollToOptions;
 class ShadowRoot;
 class StylePropertySet;
 
 enum SpellcheckAttributeState {
     SpellcheckAttributeTrue,
     SpellcheckAttributeFalse,
     SpellcheckAttributeDefault
 };
 
@@ skipping 86 matching lines @@
     // will be returned. This is not a trivial getter and its return value should be cached
     // for performance.
     AttributeCollection attributes() const;
     // This variant will not update the potentially invalid attributes. To be used when not interested
     // in style attribute or one of the SVG animation attributes.
     AttributeCollection attributesWithoutUpdate() const;
 
     void scrollIntoView(bool alignToTop = true);
     void scrollIntoViewIfNeeded(bool centerIfNeeded = true);
 
+    void distributeScroll(ScrollState&);
+    void applyScroll(ScrollState&);
+
     int offsetLeft();
     int offsetTop();
     int offsetWidth();
     int offsetHeight();
 
     Element* offsetParent();
     int clientLeft();
     int clientTop();
     int clientWidth();
     int clientHeight();
@@ skipping 698 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h