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diff --git a/Source/WebCore/page/scrolling/ScrollingTreeNode.h b/Source/WebCore/page/scrolling/ScrollingTreeNode.h
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+++ b/Source/WebCore/page/scrolling/ScrollingTreeNode.h
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+/*
+ * Copyright (C) 2012 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
+ *    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. AND ITS CONTRIBUTORS ``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 ITS 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 ScrollingTreeNode_h
+#define ScrollingTreeNode_h
+
+#if ENABLE(THREADED_SCROLLING)
+
+#include "IntRect.h"
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class PlatformWheelEvent;
+class ScrollingTree;
+class ScrollingTreeState;
+
+class ScrollingTreeNode {
+public:
+    static PassOwnPtr<ScrollingTreeNode> create(ScrollingTree*);
+    virtual ~ScrollingTreeNode();
+
+    virtual void update(ScrollingTreeState*);
+    virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
+
+protected:
+    explicit ScrollingTreeNode(ScrollingTree*);
+
+    ScrollingTree* scrollingTree() const { return m_scrollingTree; }
+    const IntRect& viewportRect() const { return m_viewportRect; }
+    const IntSize& contentsSize() const { return m_contentsSize; }
+
+private:
+    ScrollingTree* m_scrollingTree;
+
+    IntRect m_viewportRect;
+    IntSize m_contentsSize;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(THREADED_SCROLLING)
+
+#endif // ScrollingTreeNode_h