CSS Motion Path: animate offset-anchor and offset-position

third_party/WebKit/Source/core/animation/animatable/AnimatableLengthPoint.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 29 matching lines @@
     ~AnimatableLengthPoint() override { }
     static PassRefPtr<AnimatableLengthPoint> create(PassRefPtr<AnimatableValue> x, PassRefPtr<AnimatableValue> y)
     {
         return adoptRef(new AnimatableLengthPoint(std::move(x), std::move(y)));
     }
     const AnimatableValue* x() const { return m_x.get(); }
     const AnimatableValue* y() const { return m_y.get(); }
 
 protected:
     PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
 private:
     AnimatableLengthPoint(PassRefPtr<AnimatableValue> x, PassRefPtr<AnimatableValue> y)
         : m_x(x)
         , m_y(y)
     {
     }
     AnimatableType type() const override { return TypeLengthPoint; }
     bool equalTo(const AnimatableValue*) const override;
 
     RefPtr<AnimatableValue> m_x;
     RefPtr<AnimatableValue> m_y;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLengthPoint, isLengthPoint());
 
 } // namespace blink
 
 #endif // AnimatableLengthPoint_h