Web Animations: Migrate SVG Rect interpolation to interpolation types

third_party/WebKit/Source/core/svg/SVGRect.h

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 75 matching lines @@
     FloatRect m_value;
 };
 
 inline PassRefPtrWillBeRawPtr<SVGRect> toSVGRect(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)
 {
     RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGRect::classType());
     return static_pointer_cast<SVGRect>(base.release());
 }
 
+inline const SVGRect& toSVGRect(const SVGPropertyBase& base)
+{
+    ASSERT(base.type() == SVGRect::classType());
+    return static_cast<const SVGRect&>(base);
+}
 } // namespace blink
 
 #endif // SVGRect_h