Animation: Add CSSPropertyClip and CSSPropertyBorderImageSlice to StringKeyframe

Source/core/animation/LengthBoxStyleInterpolation.h

Index: Source/core/animation/LengthBoxStyleInterpolation.h
diff --git a/Source/core/animation/LengthBoxStyleInterpolation.h b/Source/core/animation/LengthBoxStyleInterpolation.h
index 1542dda42dce5f69c30f407eafbc0ce4b024e7c4..ff22f91738b913c0c9c62898c2c5b4624034beac 100644
--- a/Source/core/animation/LengthBoxStyleInterpolation.h
+++ b/Source/core/animation/LengthBoxStyleInterpolation.h
@@ -12,20 +12,20 @@ namespace blink {
 
 class LengthBoxStyleInterpolation : public StyleInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<LengthBoxStyleInterpolation> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id)
+    static PassRefPtrWillBeRawPtr<LengthBoxStyleInterpolation> maybeCreateFrom(const CSSValue& start, const CSSValue& end, CSSPropertyID id)
     {
-        return adoptRefWillBeNoop(new LengthBoxStyleInterpolation(lengthBoxtoInterpolableValue(start), lengthBoxtoInterpolableValue(end), id, false));
+        if (start.isPrimitiveValue() && toCSSPrimitiveValue(start).isRect()
+            && end.isPrimitiveValue() && toCSSPrimitiveValue(end).isRect())
+            return adoptRefWillBeNoop(new LengthBoxStyleInterpolation(lengthBoxtoInterpolableValue(start), lengthBoxtoInterpolableValue(end), id, false));
+
+        if (start.isBorderImageSliceValue() && toCSSBorderImageSliceValue(start).slices()
+            && end.isBorderImageSliceValue() && toCSSBorderImageSliceValue(end).slices()
+            && toCSSBorderImageSliceValue(start).m_fill == toCSSBorderImageSliceValue(end).m_fill)
+            return adoptRefWillBeNoop(new LengthBoxStyleInterpolation(borderImageSlicetoInterpolableValue(start), borderImageSlicetoInterpolableValue(end), id, toCSSBorderImageSliceValue(start).m_fill));
+        return nullptr;
     }
 
-    static PassRefPtrWillBeRawPtr<LengthBoxStyleInterpolation> createFromBorderImageSlice(CSSValue& start, CSSValue& end, CSSPropertyID id)
-    {
-        return adoptRefWillBeNoop(new LengthBoxStyleInterpolation(borderImageSlicetoInterpolableValue(start), borderImageSlicetoInterpolableValue(end), id, toCSSBorderImageSliceValue(start).m_fill));
-    }
-
-    static bool canCreateFrom(const CSSValue&);
-
-    static bool matchingFill(CSSValue&, CSSValue&);
-    static bool canCreateFromBorderImageSlice(CSSValue&);
+    static bool isAutoValue(const CSSValue&);
 
     virtual void apply(StyleResolverState&) const override;
     virtual void trace(Visitor*) override;
@@ -37,8 +37,8 @@ private:
     { }
 
     static PassOwnPtrWillBeRawPtr<InterpolableValue> lengthBoxtoInterpolableValue(const CSSValue&);
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> borderImageSlicetoInterpolableValue(CSSValue&);
-    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToLengthBox(InterpolableValue*, InterpolationRange = RangeAll);
+    static PassOwnPtrWillBeRawPtr<InterpolableValue> borderImageSlicetoInterpolableValue(const CSSValue&);
+    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToLengthBox(InterpolableValue*);
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToBorderImageSlice(InterpolableValue*, bool);
 
     bool m_fill;