Optimized querySelector(All) when selector contains #id.

Source/core/dom/SelectorQuery.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 38 matching lines @@
     PassRefPtr<Element> queryFirst(Node* rootNode) const;
 
 private:
     struct SelectorData {
         SelectorData(const CSSSelector* selector, bool isFastCheckable) : selector(selector), isFastCheckable(isFastCheckable) { }
         const CSSSelector* selector;
         bool isFastCheckable;
     };
 
     bool selectorMatches(const SelectorData&, Element*, const Node*) const;
-    bool canUseIdLookup(Node* rootNode) const;
+    std::pair<bool, Node*> findTraverseRoot(Node* traverseRoot) const;
     template <bool firstMatchOnly>
     void execute(Node* rootNode, Vector<RefPtr<Node> >&) const;
 
     Vector<SelectorData> m_selectors;
 };
 
 class SelectorQuery {
     WTF_MAKE_NONCOPYABLE(SelectorQuery);
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ skipping 12 matching lines @@
     SelectorQuery* add(const AtomicString&, Document*, ExceptionCode&);
     void invalidate();
 
 private:
     HashMap<AtomicString, OwnPtr<SelectorQuery> > m_entries;
 };
 
 }
 
 #endif