Implement CSSOM Smooth Scroll API

Source/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 469 matching lines @@
 int RenderBox::scrollLeft() const
 {
     return hasOverflowClip() ? layer()->scrollableArea()->scrollXOffset() : 0;
 }
 
 int RenderBox::scrollTop() const
 {
     return hasOverflowClip() ? layer()->scrollableArea()->scrollYOffset() : 0;
 }
 
-void RenderBox::setScrollLeft(int newLeft)
+void RenderBox::setScrollLeft(int newLeft, ScrollBehavior scrollBehavior)
 {
     if (hasOverflowClip())
-        layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped);
+        layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped, scrollBehavior);
 }
 
-void RenderBox::setScrollTop(int newTop)
+void RenderBox::setScrollTop(int newTop, ScrollBehavior scrollBehavior)
 {
     if (hasOverflowClip())
-        layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped);
+        layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped, scrollBehavior);
 }
 
 void RenderBox::scrollToOffset(const IntSize& offset)
 {
     ASSERT(hasOverflowClip());
     layer()->scrollableArea()->scrollToOffset(offset, ScrollOffsetClamped);
 }
 
 static inline bool frameElementAndViewPermitScroll(HTMLFrameElementBase* frameElementBase, FrameView* frameView)
 {
@@ skipping 4406 matching lines @@
         return 0;
 
     if (!layoutState && !flowThreadContainingBlock())
         return 0;
 
     RenderBlock* containerBlock = containingBlock();
     return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
 }
 
 } // namespace WebCore