Resolve URL/target reference at a single point in SVGUseElement

third_party/WebKit/Source/core/svg/SVGUseElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 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 71 matching lines @@
 
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
 
     void scheduleShadowTreeRecreation();
     void cancelShadowTreeRecreation();
     bool haveLoadedRequiredResources() override { return !isStructurallyExternal() || m_haveFiredLoadEvent; }
 
     bool selfHasRelativeLengths() const override;
 
     // Instance tree handling
+    Element* resolveTargetElement();
     void buildShadowAndInstanceTree(SVGElement& target);
     void clearInstanceRoot();
     Element* createInstanceTree(SVGElement& targetRoot) const;
     void clearShadowTree();
     bool hasCycleUseReferencing(const SVGUseElement&, const ContainerNode& targetInstance, SVGElement*& newTarget) const;
     bool expandUseElementsInShadowTree();
     void cloneNonMarkupEventListeners();
     void addReferencesToFirstDegreeNestedUseElements(SVGElement& target);
 
     void invalidateDependentShadowTrees();
 
     bool resourceIsStillLoading() const;
     bool resourceIsValid() const;
-    Document* externalDocument() const;
     bool instanceTreeIsLoading() const;
     void notifyFinished(Resource*) override;
     String debugName() const override { return "SVGUseElement"; }
+    void updateTargetReference();
     void setDocumentResource(DocumentResource*);
 
     Member<SVGAnimatedLength> m_x;
     Member<SVGAnimatedLength> m_y;
     Member<SVGAnimatedLength> m_width;
     Member<SVGAnimatedLength> m_height;
 
+    AtomicString m_elementIdentifier;
+    bool m_elementIdentifierIsLocal;
     bool m_haveFiredLoadEvent;
     bool m_needsShadowTreeRecreation;
     Member<SVGElement> m_targetElementInstance;
     Member<DocumentResource> m_resource;
 };
 
 } // namespace blink
 
 #endif // SVGUseElement_h