Web Animations API: Deferred computation of interpolated values

Source/core/animation/Interpolation.h

Index: Source/core/animation/Interpolation.h
diff --git a/Source/core/animation/Interpolation.h b/Source/core/animation/Interpolation.h
index 206310c9875007c2688dfc33ae928371aa66b074..2ebef69b03adb6438b16562685ec12d95b87d04a 100644
--- a/Source/core/animation/Interpolation.h
+++ b/Source/core/animation/Interpolation.h
@@ -72,31 +72,6 @@ protected:
     }
 };
 
-class LegacyStyleInterpolation : public StyleInterpolation {
-public:
-    static PassRefPtrWillBeRawPtr<LegacyStyleInterpolation> create(PassRefPtrWillBeRawPtr<AnimatableValue> start, PassRefPtrWillBeRawPtr<AnimatableValue> end, CSSPropertyID id)
-    {
-        return adoptRefWillBeNoop(new LegacyStyleInterpolation(InterpolableAnimatableValue::create(start), InterpolableAnimatableValue::create(end), id));
-    }
-
-    virtual void apply(StyleResolverState&) const OVERRIDE;
-
-    virtual bool isLegacyStyleInterpolation() const OVERRIDE FINAL { return true; }
-    PassRefPtrWillBeRawPtr<AnimatableValue> currentValue() const
-    {
-        InterpolableAnimatableValue* value = static_cast<InterpolableAnimatableValue*>(m_cachedValue.get());
-        return value->value();
-    }
-
-    virtual void trace(Visitor*) OVERRIDE;
-
-private:
-    LegacyStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id)
-        : StyleInterpolation(start, end, id)
-    {
-    }
-};
-
 class LengthStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<LengthStyleInterpolation> create(CSSValue* start, CSSValue* end, CSSPropertyID id)
@@ -143,7 +118,6 @@ private:
 };
 
 DEFINE_TYPE_CASTS(StyleInterpolation, Interpolation, value, value->isStyleInterpolation(), value.isStyleInterpolation());
-DEFINE_TYPE_CASTS(LegacyStyleInterpolation, Interpolation, value, value->isLegacyStyleInterpolation(), value.isLegacyStyleInterpolation());
 
 }