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

Source/core/svg/SVGFEDisplacementMapElement.h

 /*
  * Copyright (C) 2006 Oliver Hunt <oliver@nerget.com>
  *
  * 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 52 matching lines @@
             return CHANNEL_A;
         return CHANNEL_UNKNOWN;
     }
 };
 
 class SVGFEDisplacementMapElement : public SVGFilterPrimitiveStandardAttributes {
 public:
     static PassRefPtr<SVGFEDisplacementMapElement> create(const QualifiedName&, const Handle<Document>&);
 
     static ChannelSelectorType stringToChannel(const String&);
-    
+
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGFilterPrimitiveStandardAttributes::accept(visitor); }
+
 private:
     SVGFEDisplacementMapElement(const QualifiedName& tagName, const Handle<Document>&);
     
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool setFilterEffectAttribute(FilterEffect*, const QualifiedName& attrName);
     virtual void svgAttributeChanged(const QualifiedName&);
     virtual PassRefPtr<FilterEffect> build(SVGFilterBuilder*, Filter*);
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFEDisplacementMapElement)
         DECLARE_ANIMATED_STRING(In1, in1)
         DECLARE_ANIMATED_STRING(In2, in2)
         DECLARE_ANIMATED_ENUMERATION(XChannelSelector, xChannelSelector, ChannelSelectorType)
         DECLARE_ANIMATED_ENUMERATION(YChannelSelector, yChannelSelector, ChannelSelectorType)
         DECLARE_ANIMATED_NUMBER(Scale, scale)
     END_DECLARE_ANIMATED_PROPERTIES
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 #endif // SVGFEDisplacementMapElement_h