Handle direction control in compositor Animations

Source/core/animation/CompositorAnimations.h

 /*
  * Copyright (C) 2013 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 23 matching lines @@
 #include "core/animation/AnimationEffect.h"
 #include "core/animation/Timing.h"
 #include "platform/animation/TimingFunction.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Element;
 class FloatBox;
 
-// Given an input timing function between keyframe at 0 and keyframe at 1.0, we
-// need a timing function such that the behavior with the keyframes swapped is
-// equivalent to reversing time with the input timing function and keyframes.
-// This means flipping the timing function about x=0.5 and about y=0.5.
-// FIXME: Remove once the Compositor natively understands reversing time.
-class CompositorAnimationsTimingFunctionReverser {
-public:
-    static PassRefPtr<TimingFunction> reverse(const LinearTimingFunction& timefunc);
-    static PassRefPtr<TimingFunction> reverse(const CubicBezierTimingFunction& timefunc);
-    static PassRefPtr<TimingFunction> reverse(const TimingFunction& timefunc);
-};
-
 class CompositorAnimations {
 public:
     static CompositorAnimations* instance() { return instance(0); }
     static void setInstanceForTesting(CompositorAnimations* newInstance) { instance(newInstance); }
 
     virtual bool isCandidateForAnimationOnCompositor(const Timing&, const AnimationEffect&);
     virtual bool canStartAnimationOnCompositor(const Element&);
     // FIXME: This should return void. We should know ahead of time whether these animations can be started.
     virtual bool startAnimationOnCompositor(const Element&, double startTime, double timeOffset, const Timing&, const AnimationEffect&, Vector<int>& startedAnimationIds);
     virtual void cancelAnimationOnCompositor(const Element&, int id);
@@ skipping 10 matching lines @@
         if (newInstance) {
             instance = newInstance;
         }
         return instance;
     }
 };
 
 } // namespace blink
 
 #endif