Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.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 45 matching lines @@
 
 namespace blink {
 
 enum ResizerHitTestType { ResizerForPointer, ResizerForTouch };
 
 class ComputedStyle;
 class HitTestResult;
 class LayoutBox;
 class LayoutScrollbarPart;
 class PaintLayer;
+class ScrollingCoordinator;
 class StickyPositionScrollingConstraints;
 class SubtreeLayoutScope;
 
 typedef WTF::HashMap<PaintLayer*, StickyPositionScrollingConstraints>
     StickyConstraintsMap;
 
 struct CORE_EXPORT PaintLayerScrollableAreaRareData {
   WTF_MAKE_NONCOPYABLE(PaintLayerScrollableAreaRareData);
   USING_FAST_MALLOC(PaintLayerScrollableAreaRareData);
 
@@ skipping 208 matching lines @@
   bool shouldSuspendScrollAnimations() const override;
   bool scrollbarsCanBeActive() const override;
   void scrollbarVisibilityChanged() override;
   IntRect scrollableAreaBoundingBox() const override;
   void registerForAnimation() override;
   void deregisterForAnimation() override;
   bool userInputScrollable(ScrollbarOrientation) const override;
   bool shouldPlaceVerticalScrollbarOnLeft() const override;
   int pageStep(ScrollbarOrientation) const override;
   ScrollBehavior scrollBehaviorStyle() const override;
+  CompositorAnimationHost* compositorAnimationHost() const override;
   CompositorAnimationTimeline* compositorAnimationTimeline() const override;
 
   void visibleSizeChanged();
 
   // FIXME: We shouldn't allow access to m_overflowRect outside this class.
   LayoutRect overflowRect() const { return m_overflowRect; }
 
   void scrollToAbsolutePosition(
       const FloatPoint& position,
       ScrollBehavior scrollBehavior = ScrollBehaviorInstant,
@@ skipping 208 matching lines @@
   void updateScrollCornerStyle();
 
   // See comments on isPointInResizeControl.
   void updateResizerAreaSet();
   void updateResizerStyle();
 
   void updateScrollableAreaSet(bool hasOverflow);
 
   void updateCompositingLayersAfterScroll();
 
+  ScrollingCoordinator* getScrollingCoordinator() const;
+
   PaintLayerScrollableAreaRareData* rareData() { return m_rareData.get(); }
 
   PaintLayerScrollableAreaRareData& ensureRareData() {
     if (!m_rareData)
       m_rareData = WTF::makeUnique<PaintLayerScrollableAreaRareData>();
     return *m_rareData.get();
   }
 
   PaintLayer& m_layer;
 
@@ skipping 53 matching lines @@
 
 DEFINE_TYPE_CASTS(PaintLayerScrollableArea,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isPaintLayerScrollableArea(),
                   scrollableArea.isPaintLayerScrollableArea());
 
 }  // namespace blink
 
 #endif  // LayerScrollableArea_h