Add fast path for tag#id selector queries

Source/core/dom/DocumentOrderedMap.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DocumentOrderedMap_h
 #define DocumentOrderedMap_h
 
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
+#include "wtf/Vector.h"
 #include "wtf/text/StringImpl.h"
 
 namespace WebCore {
 
 class Element;
 class TreeScope;
 
 class DocumentOrderedMap {
 public:
     void add(StringImpl*, Element*);
     void remove(StringImpl*, Element*);
     void clear();
 
     bool contains(StringImpl*) const;
     bool containsMultiple(StringImpl*) const;
     // concrete instantiations of the get<>() method template
     Element* getElementById(StringImpl*, const TreeScope*) const;
+    const Vector<Element*>& getAllElementsById(StringImpl*, const TreeScope*) const;
     Element* getElementByMapName(StringImpl*, const TreeScope*) const;
     Element* getElementByLowercasedMapName(StringImpl*, const TreeScope*) const;
     Element* getElementByLabelForAttribute(StringImpl*, const TreeScope*) const;
 
     void checkConsistency() const;
 
 private:
     template<bool keyMatches(StringImpl*, Element*)> Element* get(StringImpl*, const TreeScope*) const;
 
     struct MapEntry {
         MapEntry()
             : element(0)
             , count(0)
         { }
 
         explicit MapEntry(Element* firstElement)
             : element(firstElement)
             , count(1)
         { }
 
         Element* element;
         unsigned count;
+        Vector<Element*> orderedList;
     };
 
     typedef HashMap<StringImpl*, MapEntry> Map;
 
     mutable Map m_map;
 };
 
 inline bool DocumentOrderedMap::contains(StringImpl* id) const
 {
     return m_map.contains(id);
 }
 
 inline bool DocumentOrderedMap::containsMultiple(StringImpl* id) const
 {
     Map::const_iterator it = m_map.find(id);
     return it != m_map.end() && it->value.count > 1;
 }
 
 } // namespace WebCore
 
 #endif // DocumentOrderedMap_h