Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

third_party/WebKit/Source/core/svg/SVGAnimatedString.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/svg/SVGAnimatedString.h"
 
 namespace blink {
 
 String SVGAnimatedString::baseVal()
 {
     return SVGAnimatedProperty<SVGString>::baseVal();
 }
 
 void SVGAnimatedString::setBaseVal(const String& value, ExceptionState& exceptionState)
 {
     return SVGAnimatedProperty<SVGString>::setBaseVal(value, exceptionState);
 }
 
 String SVGAnimatedString::animVal()
 {
     return SVGAnimatedProperty<SVGString>::animVal();
 }
 
+DEFINE_TRACE_WRAPPERS(SVGAnimatedString)
+{
+    visitor->traceWrappers(contextElement());
+}
+
 } // namespace blink