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diff --git a/Source/WebCore/page/FrameTree.h b/Source/WebCore/page/FrameTree.h
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+++ b/Source/WebCore/page/FrameTree.h
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+/*
+ * Copyright (C) 2006 Apple Computer, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef FrameTree_h
+#define FrameTree_h
+
+#include <wtf/text/AtomicString.h>
+
+namespace WebCore {
+
+    class Frame;
+
+    class FrameTree : public Noncopyable {
+    public:
+        FrameTree(Frame* thisFrame, Frame* parentFrame) 
+            : m_thisFrame(thisFrame)
+            , m_parent(parentFrame)
+            , m_previousSibling(0)
+            , m_lastChild(0)
+            , m_childCount(0)
+        {
+        }
+        ~FrameTree();
+
+        const AtomicString& name() const { return m_name; }
+        const AtomicString& uniqueName() const { return m_uniqueName; }
+        void setName(const AtomicString&);
+        void clearName();
+        Frame* parent(bool checkForDisconnectedFrame = false) const;
+        void setParent(Frame* parent) { m_parent = parent; }
+        
+        Frame* nextSibling() const { return m_nextSibling.get(); }
+        Frame* previousSibling() const { return m_previousSibling; }
+        Frame* firstChild() const { return m_firstChild.get(); }
+        Frame* lastChild() const { return m_lastChild; }
+        unsigned childCount() const { return m_childCount; }
+
+        bool isDescendantOf(const Frame* ancestor) const;
+        Frame* traverseNext(const Frame* stayWithin = 0) const;
+        Frame* traverseNextWithWrap(bool) const;
+        Frame* traversePreviousWithWrap(bool) const;
+        
+        void appendChild(PassRefPtr<Frame>);
+        bool transferChild(PassRefPtr<Frame>);
+        void detachFromParent() { m_parent = 0; }
+        void removeChild(Frame*);
+
+        Frame* child(unsigned index) const;
+        Frame* child(const AtomicString& name) const;
+        Frame* find(const AtomicString& name) const;
+
+        AtomicString uniqueChildName(const AtomicString& requestedName) const;
+
+        Frame* top(bool checkForDisconnectedFrame = false) const;
+
+    private:
+        Frame* deepLastChild() const;
+        void actuallyAppendChild(PassRefPtr<Frame>);
+
+        Frame* m_thisFrame;
+
+        Frame* m_parent;
+        AtomicString m_name; // The actual frame name (may be empty).
+        AtomicString m_uniqueName;
+
+        // FIXME: use ListRefPtr?
+        RefPtr<Frame> m_nextSibling;
+        Frame* m_previousSibling;
+        RefPtr<Frame> m_firstChild;
+        Frame* m_lastChild;
+        unsigned m_childCount;
+    };
+
+} // namespace WebCore
+
+#endif // FrameTree_h