virtual ScrollableArea* enclosingScrollableArea() const override;
virtual IntRect scrollableAreaBoundingBox() const override;
virtual bool scrollAnimatorEnabled() const override;
- virtual bool usesCompositedScrolling() const override;
virtual GraphicsLayer* layerForScrolling() const override;
virtual GraphicsLayer* layerForHorizontalScrollbar() const override;
virtual GraphicsLayer* layerForVerticalScrollbar() const override;