Add additive animation support for CSS property motion-rotation

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

Index: third_party/WebKit/Source/core/animation/CSSMotionRotationInterpolationType.h
diff --git a/third_party/WebKit/Source/core/animation/CSSClipInterpolationType.h b/third_party/WebKit/Source/core/animation/CSSMotionRotationInterpolationType.h
similarity index 78%
copy from third_party/WebKit/Source/core/animation/CSSClipInterpolationType.h
copy to third_party/WebKit/Source/core/animation/CSSMotionRotationInterpolationType.h
index 45a3a6e134ef812294cb1edec9a60ecf0613ed1b..dbeec445e30e2a8f43e748e465455201db246b3f 100644
--- a/third_party/WebKit/Source/core/animation/CSSClipInterpolationType.h
+++ b/third_party/WebKit/Source/core/animation/CSSMotionRotationInterpolationType.h
@@ -2,23 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CSSClipInterpolationType_h
-#define CSSClipInterpolationType_h
+#ifndef CSSMotionRotationInterpolationType_h
+#define CSSMotionRotationInterpolationType_h
 
 #include "core/animation/CSSInterpolationType.h"
 
 namespace blink {
 
-class CSSClipInterpolationType : public CSSInterpolationType {
+class CSSMotionRotationInterpolationType : public CSSInterpolationType {
 public:
-    CSSClipInterpolationType(CSSPropertyID property)
+    CSSMotionRotationInterpolationType(CSSPropertyID property)
         : CSSInterpolationType(property)
     {
-        ASSERT(property == CSSPropertyClip);
+        ASSERT(property == CSSPropertyMotionRotation);
     }
 
     InterpolationValue maybeConvertUnderlyingValue(const InterpolationEnvironment&) const final;
-    PairwiseInterpolationValue mergeSingleConversions(InterpolationValue& start, InterpolationValue& end) const final;
     void composite(UnderlyingValueOwner&, double underlyingFraction, const InterpolationValue&) const final;
     void apply(const InterpolableValue&, const NonInterpolableValue*, InterpolationEnvironment&) const final;
 
@@ -27,8 +26,9 @@ private:
     InterpolationValue maybeConvertInitial() const final;
     InterpolationValue maybeConvertInherit(const StyleResolverState&, ConversionCheckers&) const final;
     InterpolationValue maybeConvertValue(const CSSValue&, const StyleResolverState&, ConversionCheckers&) const final;
+    PairwiseInterpolationValue mergeSingleConversions(InterpolationValue& start, InterpolationValue& end) const final;
 };
 
 } // namespace blink
 
-#endif // CSSClipInterpolationType_h
+#endif // CSSMotionRotationInterpolationType_h