Web Animations CSS: Support animation of stroke-dasharray property

Source/core/animation/AnimatableRepeatable.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 32 matching lines @@
     virtual ~AnimatableRepeatable() { }
 
     // This will consume the vector passed into it.
     static PassRefPtr<AnimatableRepeatable> create(Vector<RefPtr<AnimatableValue> >& values)
     {
         return adoptRef(new AnimatableRepeatable(values));
     }
 
     const Vector<RefPtr<AnimatableValue> >& values() const { return m_values; }
 
-private:
+protected:
+    AnimatableRepeatable()
+    {
+    }
     AnimatableRepeatable(Vector<RefPtr<AnimatableValue> >& values)
     {
         ASSERT(!values.isEmpty());
         m_values.swap(values);
     }
 
+    static bool interpolateLists(const Vector<RefPtr<AnimatableValue> >& fromValues, const Vector<RefPtr<AnimatableValue> >& toValues, double fraction, Vector<RefPtr<AnimatableValue> >& interpolatedValues);
+
+    Vector<RefPtr<AnimatableValue> > m_values;
+
+private:
     virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
     virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;
 
     virtual AnimatableType type() const OVERRIDE { return TypeRepeatable; }
     virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
-
-    Vector<RefPtr<AnimatableValue> > m_values;
 };
 
 inline const AnimatableRepeatable* toAnimatableRepeatable(const AnimatableValue* value)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(value && value->isRepeatable());
     return static_cast<const AnimatableRepeatable*>(value);
 }
 
 } // namespace WebCore
 
 #endif // AnimatableRepeatable_h