Delay string conversion of attribute names until needed.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2923 matching lines @@
         recipients->enqueueMutationRecord(MutationRecord::createAttributes(this, name, oldValue));
 
     attributeWillChange(name, oldValue, newValue);
 
     InspectorInstrumentation::willModifyDOMAttr(this, oldValue, newValue);
 }
 
 void Element::didAddAttribute(const QualifiedName& name, const AtomicString& value)
 {
     attributeChanged(name, value);
-    InspectorInstrumentation::didModifyDOMAttr(this, name.toString(), value);
+    InspectorInstrumentation::didModifyDOMAttr(this, name, value);
     dispatchSubtreeModifiedEvent();
 }
 
 void Element::didModifyAttribute(const QualifiedName& name, const AtomicString& value)
 {
     attributeChanged(name, value);
-    InspectorInstrumentation::didModifyDOMAttr(this, name.toString(), value);
+    InspectorInstrumentation::didModifyDOMAttr(this, name, value);
     // Do not dispatch a DOMSubtreeModified event here; see bug 81141.
 }
 
 void Element::didRemoveAttribute(const QualifiedName& name)
 {
     attributeChanged(name, nullAtom);
-    InspectorInstrumentation::didRemoveDOMAttr(this, name.toString());
+    InspectorInstrumentation::didRemoveDOMAttr(this, name);
     dispatchSubtreeModifiedEvent();
 }
 
 static bool needsURLResolutionForInlineStyle(const Element& element, const Document& oldDocument, const Document& newDocument)
 {
     if (oldDocument == newDocument)
         return false;
     if (oldDocument.baseURL() == newDocument.baseURL())
         return false;
     const StylePropertySet* style = element.inlineStyle();
@@ skipping 452 matching lines @@
         return wrapper;
 
     CustomElementBinding* binding = perContextData->customElementBinding(customElementDefinition());
 
     wrapper->SetPrototype(binding->prototype());
 
     return V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperType, wrapper);
 }
 
 } // namespace blink