Introduce a SVGUnknownElement class for unknown SVG elements

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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
@@ skipping 136 matching lines @@
     // Rebuild pending resources for each client of a pending resource that is being removed.
     while (Element* clientElement = extensions->removeElementFromPendingResourcesForRemoval(resourceId)) {
         ASSERT(clientElement->hasPendingResources());
         if (clientElement->hasPendingResources()) {
             clientElement->buildPendingResource();
             extensions->clearHasPendingResourcesIfPossible(clientElement);
         }
     }
 }
 
-bool SVGElement::rendererIsNeededInternal(const NodeRenderingContext& context)
+bool SVGElement::rendererIsNeeded(const NodeRenderingContext& context)
 {
     // http://www.w3.org/TR/SVG/extend.html#PrivateData
     // Prevent anything other than SVG renderers from appearing in our render tree
     // Spec: SVG allows inclusion of elements from foreign namespaces anywhere
     // with the SVG content. In general, the SVG user agent will include the unknown
     // elements in the DOM but will otherwise ignore unknown elements.
     if (!parentOrShadowHostElement() || parentOrShadowHostElement()->isSVGElement())
         return Element::rendererIsNeeded(context);
 
     return false;
@@ skipping 974 matching lines @@
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 
 }