Oilpan: Ensure that classes with virtual trace methods always have vtables for their left-most base…

Source/core/svg/SVGFEImageElement.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 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 26 matching lines @@
                                 public SVGURIReference,
                                 public ImageResourceClient {
 public:
     DECLARE_NODE_FACTORY(SVGFEImageElement);
 
     bool currentFrameHasSingleSecurityOrigin() const;
 
     virtual ~SVGFEImageElement();
     SVGAnimatedPreserveAspectRatio* preserveAspectRatio() { return m_preserveAspectRatio.get(); }
 
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        SVGFilterPrimitiveStandardAttributes::trace(visitor);
+        ImageResourceClient::trace(visitor);
+    }
+
 private:
     explicit SVGFEImageElement(Document&);
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&) OVERRIDE;
     virtual void notifyFinished(Resource*) OVERRIDE;
 
     virtual PassRefPtr<FilterEffect> build(SVGFilterBuilder*, Filter*) OVERRIDE;
 
     void clearResourceReferences();
     void fetchImageResource();
 
     virtual void buildPendingResource() OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 
     RefPtr<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
 
     ResourcePtr<ImageResource> m_cachedImage;
 };
 
 } // namespace blink
 
 #endif