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 380 matching lines @@
 
 int RenderBox::pixelSnappedScrollHeight() const
 {
     if (hasOverflowClip())
         return layer()->scrollableArea()->scrollHeight();
     // For objects with visible overflow, this matches IE.
     // FIXME: Need to work right with writing modes.
     return snapSizeToPixel(scrollHeight(), y() + clientTop());
 }
 
-void RenderBox::setScrollLeft(LayoutUnit newLeft)
+void RenderBox::setScrollLeft(LayoutUnit newLeft, ScrollBehavior scrollBehavior)
 {
     // This doesn't hit in any tests, but since the equivalent code in setScrollTop
     // does, presumably this code does as well.
     DisableCompositingQueryAsserts disabler;
 
     if (hasOverflowClip())
-        layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped);
+        layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped, scrollBehavior);
 }
 
-void RenderBox::setScrollTop(LayoutUnit newTop)
+void RenderBox::setScrollTop(LayoutUnit newTop, ScrollBehavior scrollBehavior)
 {
     // Hits in compositing/overflow/do-not-assert-on-invisible-composited-layers.html
     DisableCompositingQueryAsserts disabler;
 
     if (hasOverflowClip())
-        layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped);
+        layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped, scrollBehavior);
 }
 
 void RenderBox::scrollToOffset(const IntSize& offset)
 {
     ASSERT(hasOverflowClip());
 
     // This doesn't hit in any tests, but since the equivalent code in setScrollTop
     // does, presumably this code does as well.
     DisableCompositingQueryAsserts disabler;
     layer()->scrollableArea()->scrollToOffset(offset, ScrollOffsetClamped);
@@ skipping 4211 matching lines @@
 
         // We need the old border box size only when the box has background or box decorations.
         if (!style()->hasBackground() && !style()->hasBoxDecorations())
             return;
     }
 
     ensureRareData().m_previousBorderBoxSize = size();
 }
 
 } // namespace WebCore