Resolve URL/target reference at a single point in SVGUseElement

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

Index: third_party/WebKit/Source/core/svg/SVGUseElement.h
diff --git a/third_party/WebKit/Source/core/svg/SVGUseElement.h b/third_party/WebKit/Source/core/svg/SVGUseElement.h
index e54a8b952dda1b9fd4291a7b4066c4a83cc2609c..26fe4b622f1cacbb5a0581aceecae82508aa4748 100644
--- a/third_party/WebKit/Source/core/svg/SVGUseElement.h
+++ b/third_party/WebKit/Source/core/svg/SVGUseElement.h
@@ -89,6 +89,7 @@ private:
     bool selfHasRelativeLengths() const override;
 
     // Instance tree handling
+    Element* resolveTargetElement();
     void buildShadowAndInstanceTree(SVGElement& target);
     void clearInstanceRoot();
     Element* createInstanceTree(SVGElement& targetRoot) const;
@@ -102,10 +103,10 @@ private:
 
     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;
@@ -113,6 +114,8 @@ private:
     Member<SVGAnimatedLength> m_width;
     Member<SVGAnimatedLength> m_height;
 
+    AtomicString m_elementIdentifier;
+    bool m_elementIdentifierIsLocal;
     bool m_haveFiredLoadEvent;
     bool m_needsShadowTreeRecreation;
     Member<SVGElement> m_targetElementInstance;