Takeover MT initiated animations from the compositor

third_party/WebKit/Source/platform/scroll/ScrollAnimator.h

 /*
  * Copyright (c) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "platform/animation/CompositorAnimationPlayerClient.h"
 #include "platform/animation/CompositorScrollOffsetAnimationCurve.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/scroll/ScrollAnimatorBase.h"
 
 namespace blink {
 
 class ScrollAnimatorTest;
 class CompositorAnimationTimeline;
 
-class PLATFORM_EXPORT ScrollAnimator final : public ScrollAnimatorBase {
+class PLATFORM_EXPORT ScrollAnimator : public ScrollAnimatorBase {
 public:
     explicit ScrollAnimator(ScrollableArea*, WTF::TimeFunction = WTF::monotonicallyIncreasingTime);
     ~ScrollAnimator() override;
 
     bool hasRunningAnimation() const override;
     FloatSize computeDeltaToConsume(const FloatSize& delta) const override;
 
     ScrollResult userScroll(ScrollGranularity, const FloatSize& delta) override;
     void scrollToOffsetWithoutAnimation(const FloatPoint&) override;
     FloatPoint desiredTargetPosition() const override;
 
     // ScrollAnimatorCompositorCoordinator implementation.
     void tickAnimation(double monotonicTime) override;
     void cancelAnimation() override;
+    void takeoverCompositorAnimation() override;
     void resetAnimationState() override;
     void updateCompositorAnimations() override;
     void notifyCompositorAnimationFinished(int groupId) override;
     void notifyCompositorAnimationAborted(int groupId) override;
     void layerForCompositedScrollingDidChange(CompositorAnimationTimeline*) override;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
+    // Returns whether or not the animation was sent to the compositor.
+    virtual bool sendAnimationToCompositor();
+
     void notifyAnimationTakeover(
         double monotonicTime,
         double animationStartTime,
         scoped_ptr<cc::AnimationCurve>) override;
 
     OwnPtr<CompositorScrollOffsetAnimationCurve> m_animationCurve;
     double m_startTime;
     WTF::TimeFunction m_timeFunction;
 
 private:
@@ skipping 12 matching lines @@
     // because we are already at targetPos.
     bool willAnimateToOffset(const FloatPoint& targetPos);
 
     FloatPoint m_targetOffset;
     ScrollGranularity m_lastGranularity;
 };
 
 } // namespace blink
 
 #endif // ScrollAnimator_h