[oilpan] Implement accept methods to trace the class hierarchy of SVGElement and all sub-classes.

Source/core/svg/SVGTRefElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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,
@@ skipping 17 matching lines @@
 namespace WebCore {
 
 class SVGTRefTargetEventListener;
 
 class SVGTRefElement : public SVGTextPositioningElement,
                        public SVGURIReference {
     DEFINE_SELF_HANDLE(SVGTRefElement)
 public:
     static PassRefPtr<SVGTRefElement> create(const QualifiedName&, const Handle<Document>&);
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGTextPositioningElement::accept(visitor); }
+
 private:
     friend class SVGTRefTargetEventListener;
 
     SVGTRefElement(const QualifiedName&, const Handle<Document>&);
     virtual ~SVGTRefElement();
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&);
 
@@ skipping 14 matching lines @@
         DECLARE_ANIMATED_STRING(Href, href)
     END_DECLARE_ANIMATED_PROPERTIES
 
     RefPtr<SVGTRefTargetEventListener> m_targetListener;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 #endif