Animations: Port ProgrammaticScrollAnimator to use compositor timelines

Source/platform/scroll/ProgrammaticScrollAnimator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ProgrammaticScrollAnimator_h
 #define ProgrammaticScrollAnimator_h
 
 #include "platform/geometry/FloatPoint.h"
+#include "public/platform/WebCompositorAnimationDelegate.h"
+#include "public/platform/WebCompositorAnimationPlayerClient.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class ScrollableArea;
+class WebCompositorAnimationPlayer;
+class WebCompositorAnimationTimeline;
 class WebScrollOffsetAnimationCurve;
 
 // Animator for fixed-destination scrolls, such as those triggered by
 // CSSOM View scroll APIs.
-class ProgrammaticScrollAnimator {
+class ProgrammaticScrollAnimator : private WebCompositorAnimationPlayerClient, WebCompositorAnimationDelegate {
     WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);
     WTF_MAKE_FAST_ALLOCATED(ProgrammaticScrollAnimator);
 public:
     static PassOwnPtr<ProgrammaticScrollAnimator> create(ScrollableArea*);
 
     ~ProgrammaticScrollAnimator();
 
     void scrollToOffsetWithoutAnimation(const FloatPoint&);
     void animateToOffset(FloatPoint);
     void cancelAnimation();
     void tickAnimation(double monotonicTime);
     bool hasAnimationThatRequiresService() const;
     void updateCompositorAnimations();
-    void layerForCompositedScrollingDidChange();
+    void layerForCompositedScrollingDidChange(WebCompositorAnimationTimeline*);
     void notifyCompositorAnimationFinished(int groupId);
+    // WebCompositorAnimationDelegate implementation.
+    void notifyAnimationStarted(double monotonicTime, int group) override;
+    void notifyAnimationFinished(double monotonicTime, int group) override;
+
+    // WebCompositorAnimationPlayerClient implementation.
+    WebCompositorAnimationPlayer* compositorPlayer() const override;
 
 private:
     explicit ProgrammaticScrollAnimator(ScrollableArea*);
 
     enum class RunState {
         // No animation.
         Idle,
 
         // Waiting to send an animation to the compositor. There might also
         // already be another animation running on the compositor that will need
         // to be canceled first.
         WaitingToSendToCompositor,
 
         // Running an animation on the compositor.
         RunningOnCompositor,
 
         // Running an animation on the main thread.
         RunningOnMainThread,
 
         // Waiting to cancel the animation currently running on the compositor.
         // There is no pending animation to replace the canceled animation.
         WaitingToCancelOnCompositor
     };
 
     void resetAnimationState();
     void notifyPositionChanged(const DoublePoint&);
+    void reattachCompositorPlayerIfNeeded(WebCompositorAnimationTimeline*);
+
+    OwnPtr<WebCompositorAnimationPlayer> m_compositorPlayer;
+    int m_compositorAnimationAttachedToLayerId;
 
     ScrollableArea* m_scrollableArea;
     OwnPtr<WebScrollOffsetAnimationCurve> m_animationCurve;
     FloatPoint m_targetOffset;
     double m_startTime;
     RunState m_runState;
     int m_compositorAnimationId;
     int m_compositorAnimationGroupId;
 };
 
 } // namespace blink
 
 #endif // ProgrammaticScrollAnimator_h