Implement CSSOM Smooth Scroll API

Source/core/rendering/RenderLayerScrollableArea.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 92 matching lines @@
     virtual IntSize contentsSize() const OVERRIDE;
     virtual IntSize overhangAmount() const OVERRIDE;
     virtual IntPoint lastKnownMousePosition() const OVERRIDE;
     virtual bool shouldSuspendScrollAnimations() const OVERRIDE;
     virtual bool scrollbarsCanBeActive() const OVERRIDE;
     virtual IntRect scrollableAreaBoundingBox() const OVERRIDE;
     virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE;
     virtual bool shouldPlaceVerticalScrollbarOnLeft() const OVERRIDE;
     virtual int pageStep(ScrollbarOrientation) const OVERRIDE;
 
+    virtual bool registerForAnimation() OVERRIDE;
+    virtual void deregisterForAnimation() OVERRIDE;
+    virtual bool scheduleAnimation() OVERRIDE;
+
     int scrollXOffset() const { return m_scrollOffset.width() + scrollOrigin().x(); }
     int scrollYOffset() const { return m_scrollOffset.height() + scrollOrigin().y(); }
 
     IntSize scrollOffset() const { return m_scrollOffset; }
 
     // FIXME: We shouldn't allow access to m_overflowRect outside this class.
     LayoutRect overflowRect() const { return m_overflowRect; }
 
-    void scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping = ScrollOffsetUnclamped);
-    void scrollToXOffset(int x, ScrollOffsetClamping clamp = ScrollOffsetUnclamped) { scrollToOffset(IntSize(x, scrollYOffset()), clamp); }
-    void scrollToYOffset(int y, ScrollOffsetClamping clamp = ScrollOffsetUnclamped) { scrollToOffset(IntSize(scrollXOffset(), y), clamp); }
+    void scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping = ScrollOffsetUnclamped, ScrollBehavior = ScrollBehaviorInstant);
+    void scrollToXOffset(int x, ScrollOffsetClamping clamp = ScrollOffsetUnclamped, ScrollBehavior scrollBehavior = ScrollBehaviorInstant)
+    {
+        scrollToOffset(IntSize(x, scrollYOffset()), clamp, scrollBehavior);
+    }
+    void scrollToYOffset(int y, ScrollOffsetClamping clamp = ScrollOffsetUnclamped, ScrollBehavior scrollBehavior = ScrollBehaviorInstant)
+    {
+        scrollToOffset(IntSize(scrollXOffset(), y), clamp, scrollBehavior);
+    }
 
     void updateAfterLayout();
     void updateAfterStyleChange(const RenderStyle*);
 
     bool hasScrollbar() const { return m_hBar || m_vBar; }
 
     // FIXME: This should be removed.
     bool hasScrollCorner() const { return m_scrollCorner; }
 
     void resize(const PlatformEvent&, const LayoutSize&);
@@ skipping 85 matching lines @@
     void updateScrollableAreaSet(bool hasOverflow);
 
     void updateCompositingLayersAfterScroll();
     virtual void updateNeedsCompositedScrolling() OVERRIDE;
     bool setNeedsCompositedScrolling(bool);
 
     virtual void updateHasVisibleNonLayerContent() OVERRIDE;
 
     void setForceNeedsCompositedScrolling(ForceNeedsCompositedScrollingMode);
 
+    virtual bool compositedScrollAnimationsEnabled() const OVERRIDE;
+
     RenderBox* m_box;
 
     // Keeps track of whether the layer is currently resizing, so events can cause resizing to start and stop.
     unsigned m_inResizeMode : 1;
 
     unsigned m_scrollDimensionsDirty : 1;
     unsigned m_inOverflowRelayout : 1;
 
     unsigned m_needsCompositedScrolling : 1;
     unsigned m_willUseCompositedScrollingHasBeenRecorded : 1;
@@ skipping 17 matching lines @@
     // Renderers to hold our custom scroll corner.
     RenderScrollbarPart* m_scrollCorner;
 
     // Renderers to hold our custom resizer.
     RenderScrollbarPart* m_resizer;
 };
 
 } // Namespace WebCore
 
 #endif // RenderLayerScrollableArea_h