Move viewport actions into an ApplyScroll callback.

third_party/WebKit/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 381 matching lines @@
     virtual const AtomicString imageSourceURL() const;
     virtual Image* imageContents() { return nullptr; }
 
     virtual void focus(const FocusParams& = FocusParams());
     virtual void updateFocusAppearance(SelectionBehaviorOnFocus);
     virtual void blur();
 
     void setDistributeScroll(ScrollStateCallback*, String nativeScrollBehavior);
     void nativeDistributeScroll(ScrollState&);
     void setApplyScroll(ScrollStateCallback*, String nativeScrollBehavior);
+    void removeApplyScroll();
     void nativeApplyScroll(ScrollState&);
 
     void callDistributeScroll(ScrollState&);
     void callApplyScroll(ScrollState&);
 
+    ScrollStateCallback* getApplyScroll();
+
     // Whether this element can receive focus at all. Most elements are not
     // focusable but some elements, such as form controls and links, are. Unlike
     // layoutObjectIsFocusable(), this method may be called when layout is not up to
     // date, so it must not use the layoutObject to determine focusability.
     virtual bool supportsFocus() const;
     // isFocusable(), isKeyboardFocusable(), and isMouseFocusable() check
     // whether the element can actually be focused. Callers should ensure
     // ComputedStyle is up to date;
     // e.g. by calling Document::updateLayoutTreeIgnorePendingStylesheets().
     bool isFocusable() const;
@@ skipping 531 matching lines @@
     static RawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     RawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return new T(tagName, document); \
     }
 
 } // namespace blink
 
 #endif // Element_h