[SVG] SVGAnimatedRect migration to new SVG property impl.

Source/core/svg/SVGGraphicsElement.idl

 /*
  * Copyright (C) 2013 Samsung Electronics. 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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 interface SVGGraphicsElement : SVGElement {
     readonly attribute SVGAnimatedTransformList transform;
 
     [MeasureAs=SVGLocatableNearestViewportElement] readonly attribute SVGElement nearestViewportElement;
     [MeasureAs=SVGLocatableFarthestViewportElement] readonly attribute SVGElement farthestViewportElement;
 
-    SVGRect   getBBox();
-    SVGRect   getStrokeBBox();
+    [ImplementedAs=getBBoxFromJavascript] SVGRect getBBox();
+    [ImplementedAs=getStrokeBBoxFromJavascript] SVGRect getStrokeBBox();
     SVGMatrix getCTM();
     SVGMatrix getScreenCTM();
     [RaisesException] SVGMatrix getTransformToElement([Default=Undefined] optional SVGElement element);
 };
 
 SVGGraphicsElement implements SVGTests;