Web Animations CSS: Support animation of background-position and background-image

Source/core/animation/AnimatableValue.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
     }
 
     bool isClipPathOperation() const { return type() == TypeClipPathOperation; }
     bool isColor() const { return type() == TypeColor; }
     bool isDouble() const { return type() == TypeDouble; }
     bool isImage() const { return type() == TypeImage; }
     bool isLength() const { return type() == TypeLength; }
     bool isLengthBox() const { return type() == TypeLengthBox; }
     bool isLengthSize() const { return type() == TypeLengthSize; }
     bool isNeutral() const { return type() == TypeNeutral; }
+    bool isRepeatable() const { return type() == TypeRepeatable; }
     bool isSVGLength() const { return type() == TypeSVGLength; }
     bool isShapeValue() const { return type() == TypeShapeValue; }
     bool isSVGPaint() const { return type() == TypeSVGPaint; }
     bool isTransform() const { return type() == TypeTransform; }
     bool isUnknown() const { return type() == TypeUnknown; }
     bool isVisibility() const { return type() == TypeVisibility; }
 
+    bool isSameType(const AnimatableValue* value) const
+    {
+        ASSERT(value);
+        return value->type() == type();
+    }
+
 protected:
     enum AnimatableType {
         TypeClipPathOperation,
         TypeColor,
         TypeDouble,
         TypeImage,
         TypeLength,
         TypeLengthBox,
         TypeLengthSize,
         TypeNeutral,
+        TypeRepeatable,
         TypeSVGLength,
         TypeShapeValue,
         TypeSVGPaint,
         TypeTransform,
         TypeUnknown,
         TypeVisibility,
     };
 
-    bool isSameType(const AnimatableValue* value) const
-    {
-        ASSERT(value);
-        return value->type() == type();
-    }
-
     virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const = 0;
     static PassRefPtr<AnimatableValue> defaultInterpolateTo(const AnimatableValue* left, const AnimatableValue* right, double fraction) { return takeConstRef((fraction < 0.5) ? left : right); }
 
     // For noncommutative values read A->addWith(B) to mean the value A with B composed onto it.
     virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const;
     static PassRefPtr<AnimatableValue> defaultAddWith(const AnimatableValue* left, const AnimatableValue* right) { return takeConstRef(right); }
 
     template <class T>
     static PassRefPtr<T> takeConstRef(const T* value) { return PassRefPtr<T>(const_cast<T*>(value)); }
 
 private:
     virtual AnimatableType type() const = 0;
     // Implementations can assume that the object being compared has the same type as the object this is called on
     virtual bool equalTo(const AnimatableValue*) const = 0;
 };
 
 } // namespace WebCore
 
 #endif // AnimatableValue_h