Web Animations: Migrate SVG Rect interpolation to interpolation types

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

Index: third_party/WebKit/Source/core/svg/SVGRect.h
diff --git a/third_party/WebKit/Source/core/svg/SVGRect.h b/third_party/WebKit/Source/core/svg/SVGRect.h
index d2cf1f7d4a8dbcb1f12f5a98f97070fda84a92e5..c9ccd027f5903a89f84ea91f033c6df4ce275bab 100644
--- a/third_party/WebKit/Source/core/svg/SVGRect.h
+++ b/third_party/WebKit/Source/core/svg/SVGRect.h
@@ -93,6 +93,11 @@ inline PassRefPtrWillBeRawPtr<SVGRect> toSVGRect(PassRefPtrWillBeRawPtr<SVGPrope
     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