Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

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

 /*
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  *
  * 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 38 matching lines @@
     String viewBoxString() const;
     String preserveAspectRatioString() const;
     String transformString() const;
     String viewTargetString() const { return m_viewTargetString; }
     // override SVGZoomAndPan.setZoomAndPan so can throw exception on write
     void setZoomAndPan(unsigned short value) { } // read only
     void setZoomAndPan(unsigned short value, ExceptionState&);
 
     DECLARE_VIRTUAL_TRACE();
 
+    DECLARE_VIRTUAL_TRACE_WRAPPERS();
+
     SVGSVGElement* contextElement() { return m_contextElement.get(); }
 
 private:
     explicit SVGViewSpec(SVGSVGElement*);
 
     template<typename CharType>
     bool parseViewSpecInternal(const CharType* ptr, const CharType* end);
 
     Member<SVGSVGElement> m_contextElement;
     Member<SVGAnimatedTransformList> m_transform;
@@ skipping 11 matching lines @@
         preserveAspectRatio()->baseValue()->setMeetOrSlice(inheritFromElement->preserveAspectRatio()->currentValue()->meetOrSlice());
     }
 
     if (inheritFromElement->hasAttribute(SVGNames::zoomAndPanAttr))
         setZoomAndPan(inheritFromElement->zoomAndPan());
 }
 
 } // namespace blink
 
 #endif // SVGViewSpec_h