Implement CSSOM Smooth Scroll API

Source/core/rendering/RenderTextControlSingleLine.h

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 45 matching lines @@
 
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE FINAL;
 
     virtual void autoscroll(const IntPoint&) OVERRIDE FINAL;
 
     // Subclassed to forward to our inner div.
     virtual LayoutUnit scrollLeft() const OVERRIDE FINAL;
     virtual LayoutUnit scrollTop() const OVERRIDE FINAL;
     virtual LayoutUnit scrollWidth() const OVERRIDE FINAL;
     virtual LayoutUnit scrollHeight() const OVERRIDE FINAL;
-    virtual void setScrollLeft(LayoutUnit) OVERRIDE FINAL;
-    virtual void setScrollTop(LayoutUnit) OVERRIDE FINAL;
+    virtual void setScrollLeft(LayoutUnit, ScrollBehavior) OVERRIDE FINAL;
+    virtual void setScrollTop(LayoutUnit, ScrollBehavior) OVERRIDE FINAL;
 
     int textBlockWidth() const;
     virtual float getAvgCharWidth(AtomicString family) OVERRIDE FINAL;
     virtual LayoutUnit preferredContentLogicalWidth(float charWidth) const OVERRIDE FINAL;
     virtual LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const OVERRIDE;
 
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
 
     bool textShouldBeTruncated() const;
 
@@ skipping 18 matching lines @@
         return orientation == HorizontalScrollbar;
     }
     virtual bool scrollsOverflowX() const OVERRIDE { return hasOverflowClip(); }
     virtual bool scrollsOverflowY() const OVERRIDE { return false; }
     virtual bool hasLineIfEmpty() const OVERRIDE { return true; }
 };
 
 }
 
 #endif