Port CSS visibility animations to CSSInterpolationTypes

third_party/WebKit/Source/core/animation/CSSVisibilityInterpolationType.h

 // Copyright 2015 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 CSSShadowListInterpolationType_h
-#define CSSShadowListInterpolationType_h
+#ifndef CSSVisibilityInterpolationType_h
+#define CSSVisibilityInterpolationType_h
 
 #include "core/animation/CSSInterpolationType.h"
+#include "core/style/ComputedStyleConstants.h"
 
 namespace blink {
 
-class ShadowList;
-
-class CSSShadowListInterpolationType : public CSSInterpolationType {
+class CSSVisibilityInterpolationType : public CSSInterpolationType {
 public:
-    CSSShadowListInterpolationType(CSSPropertyID property)
+    CSSVisibilityInterpolationType(CSSPropertyID property)
         : CSSInterpolationType(property)
-    { }
+    {
+        ASSERT(property == CSSPropertyVisibility);
+    }
 
     PassOwnPtr<InterpolationValue> maybeConvertUnderlyingValue(const InterpolationEnvironment&) const final;
+    PassOwnPtr<PairwisePrimitiveInterpolation> mergeSingleConversions(InterpolationValue& startValue, InterpolationValue& endValue) const final;
     void composite(UnderlyingValue&, double underlyingFraction, const InterpolationValue&) const final;
     void apply(const InterpolableValue&, const NonInterpolableValue*, InterpolationEnvironment&) const final;
 
 private:
-    PassOwnPtr<InterpolationValue> convertShadowList(const ShadowList*, double zoom) const;
-    PassOwnPtr<InterpolationValue> createNeutralValue() const;
-
+    PassOwnPtr<InterpolationValue> createVisibilityValue(EVisibility) const;
     PassOwnPtr<InterpolationValue> maybeConvertNeutral(const UnderlyingValue&, ConversionCheckers&) const final;
     PassOwnPtr<InterpolationValue> maybeConvertInitial() const final;
     PassOwnPtr<InterpolationValue> maybeConvertInherit(const StyleResolverState&, ConversionCheckers&) const final;
     PassOwnPtr<InterpolationValue> maybeConvertValue(const CSSValue&, const StyleResolverState&, ConversionCheckers&) const final;
-    PassOwnPtr<PairwisePrimitiveInterpolation> mergeSingleConversions(InterpolationValue& startValue, InterpolationValue& endValue) const final;
+
 };
 
 } // namespace blink
 
-#endif // CSSShadowListInterpolationType_h
+#endif // CSSVisibilityInterpolationType_h