Add animatable flag to CSSProperties.in

Source/core/css/CSSPropertyMetadata.h

 // Copyright 2014 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 CSSPropertyEquality_h
-#define CSSPropertyEquality_h
+#ifndef CSSPropertyMetadata_h
+#define CSSPropertyMetadata_h
 
 #include "core/CSSPropertyNames.h"
 
 namespace blink {
 
-class RenderStyle;
-
-class CSSPropertyEquality {
+class CSSPropertyMetadata {
 public:
-    static bool propertiesEqual(CSSPropertyID, const RenderStyle&, const RenderStyle&);
+    static bool isAnimatableProperty(CSSPropertyID);
 };
 
 } // namespace blink
 
-#endif // CSSPropertyEquality_h
+#endif // CSSPropertyMetadata