Introduce a SVGUnknownElement class for unknown SVG elements

Source/core/svg/SVGScriptElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 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 57 matching lines @@
     virtual String languageAttributeValue() const;
     virtual String forAttributeValue() const;
     virtual String eventAttributeValue() const;
     virtual bool asyncAttributeValue() const;
     virtual bool deferAttributeValue() const;
     virtual bool hasSourceAttribute() const;
 
     virtual void dispatchLoadEvent() { SVGExternalResourcesRequired::dispatchLoadEvent(this); }
 
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren();
+    virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE { return false; }
 
     // SVGExternalResourcesRequired
     virtual void setHaveFiredLoadEvent(bool) OVERRIDE;
     virtual bool isParserInserted() const OVERRIDE;
     virtual bool haveFiredLoadEvent() const OVERRIDE;
     virtual Timer<SVGElement>* svgLoadEventTimer() OVERRIDE;
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGScriptElement)
         DECLARE_ANIMATED_STRING(Href, href)
         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 
     String m_type;
     Timer<SVGElement> m_svgLoadEventTimer;
     OwnPtr<ScriptLoader> m_loader;
 };
 
 inline SVGScriptElement* toSVGScriptElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::scriptTag));
     return static_cast<SVGScriptElement*>(node);
 }
 
 } // namespace WebCore
 
 #endif