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

Source/core/svg/SVGFontElement.h

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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.
  *
@@ skipping 52 matching lines @@
 
     float horizontalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;
     float verticalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;
 
     // Used by SimpleFontData/WidthIterator.
     SVGGlyph svgGlyphForGlyph(Glyph);
     Glyph missingGlyph();
 
     SVGMissingGlyphElement* firstMissingGlyphElement() const;
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGStyledElement::accept(visitor); }
+
 private:
     SVGFontElement(const QualifiedName&, const Handle<Document>&);
 
     virtual bool rendererIsNeeded(const NodeRenderingContext&) { return false; }  
 
     void ensureGlyphCache();
     void registerLigaturesInGlyphCache(Vector<String>&);
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFontElement)
         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 
     KerningPairVector m_horizontalKerningPairs;
     KerningPairVector m_verticalKerningPairs;
     SVGGlyphMap m_glyphMap;
     Glyph m_missingGlyph;
     bool m_isGlyphCacheValid;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG_FONTS)
 #endif