Implement CSSOM Smooth Scroll API

Source/core/rendering/RenderListBox.h

Index: Source/core/rendering/RenderListBox.h
diff --git a/Source/core/rendering/RenderListBox.h b/Source/core/rendering/RenderListBox.h
index 9a99eab5f179f79c9458d7a1b5389b76e6aa304b..0a503de67f03db7cb4bd6a3a23d51f1a7e3cc38f 100644
--- a/Source/core/rendering/RenderListBox.h
+++ b/Source/core/rendering/RenderListBox.h
@@ -97,8 +97,8 @@ private:
     virtual LayoutUnit scrollTop() const OVERRIDE;
     virtual LayoutUnit scrollWidth() const OVERRIDE;
     virtual LayoutUnit scrollHeight() const OVERRIDE;
-    virtual void setScrollLeft(LayoutUnit) OVERRIDE;
-    virtual void setScrollTop(LayoutUnit) OVERRIDE;
+    virtual void setScrollLeft(LayoutUnit, ScrollBehavior) OVERRIDE;
+    virtual void setScrollTop(LayoutUnit, ScrollBehavior) OVERRIDE;
 
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
 
@@ -122,6 +122,9 @@ private:
     virtual IntPoint lastKnownMousePosition() const OVERRIDE;
     virtual bool shouldSuspendScrollAnimations() const OVERRIDE;
     virtual bool scrollbarsCanBeActive() const OVERRIDE;
+    virtual void registerForAnimation() OVERRIDE;
+    virtual void deregisterForAnimation() OVERRIDE;
+    virtual bool scheduleAnimation() OVERRIDE;
     virtual IntPoint minimumScrollPosition() const OVERRIDE;
     virtual IntPoint maximumScrollPosition() const OVERRIDE;
     virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE;