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diff --git a/Source/WebCore/dom/TreeScope.h b/Source/WebCore/dom/TreeScope.h
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+/*
+ * Copyright (C) 2011 Google 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
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 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 TreeScope_h
+#define TreeScope_h
+
+#include "ContainerNode.h"
+#include "DocumentOrderedMap.h"
+
+namespace WebCore {
+
+class Element;
+class HTMLMapElement;
+
+class TreeScope : public ContainerNode {
+    friend class Document;
+
+public:
+    TreeScope* parentTreeScope() const { return m_parentTreeScope; }
+
+    Element* getElementById(const AtomicString&) const;
+    bool hasElementWithId(AtomicStringImpl* id) const;
+    bool containsMultipleElementsWithId(const AtomicString& id) const;
+    void addElementById(const AtomicString& elementId, Element*);
+    void removeElementById(const AtomicString& elementId, Element*);
+
+    void addImageMap(HTMLMapElement*);
+    void removeImageMap(HTMLMapElement*);
+    HTMLMapElement* getImageMap(const String& url) const;
+
+    Element* getElementByAccessKey(const String& key) const;
+    void invalidateAccessKeyMap();
+
+    void addNodeListCache() { ++m_numNodeListCaches; }
+    void removeNodeListCache() { ASSERT(m_numNodeListCaches > 0); --m_numNodeListCaches; }
+    bool hasNodeListCaches() const { return m_numNodeListCaches; }
+
+    // Find first anchor with the given name.
+    // First searches for an element with the given ID, but if that fails, then looks
+    // for an anchor with the given name. ID matching is always case sensitive, but
+    // Anchor name matching is case sensitive in strict mode and not case sensitive in
+    // quirks mode for historical compatibility reasons.
+    Element* findAnchor(const String& name);
+
+protected:
+    TreeScope(Document*, ConstructionType = CreateContainer);
+
+    virtual ~TreeScope();
+
+    void destroyTreeScopeData();
+
+    void setParentTreeScope(TreeScope*);
+
+private:
+    TreeScope* m_parentTreeScope;
+
+    DocumentOrderedMap m_elementsById;
+    DocumentOrderedMap m_imageMapsByName;
+
+    mutable HashMap<StringImpl*, Element*, CaseFoldingHash> m_elementsByAccessKey;    
+    mutable bool m_accessKeyMapValid;
+
+    unsigned m_numNodeListCaches;
+};
+
+inline bool TreeScope::hasElementWithId(AtomicStringImpl* id) const
+{
+    ASSERT(id);
+    return m_elementsById.contains(id);
+}
+
+inline bool TreeScope::containsMultipleElementsWithId(const AtomicString& id) const
+{
+    return m_elementsById.containsMultiple(id.impl());
+}
+
+} // namespace WebCore
+
+#endif // TreeScope_h
+