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diff --git a/WebCore/platform/ScrollbarThemeComposite.h b/WebCore/platform/ScrollbarThemeComposite.h
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+++ b/WebCore/platform/ScrollbarThemeComposite.h
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+/*
+ * Copyright (C) 2008 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. ``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 ScrollbarThemeComposite_h
+#define ScrollbarThemeComposite_h
+
+#include "ScrollbarTheme.h"
+
+namespace WebCore {
+
+class ScrollbarThemeComposite : public ScrollbarTheme {
+public:
+    virtual bool paint(Scrollbar*, GraphicsContext* context, const IntRect& damageRect);
+
+    virtual ScrollbarPart hitTest(Scrollbar*, const PlatformMouseEvent&);
+
+    virtual void invalidatePart(Scrollbar*, ScrollbarPart);
+
+    virtual int thumbPosition(Scrollbar*);
+    virtual int thumbLength(Scrollbar*);
+    virtual int trackPosition(Scrollbar*);
+    virtual int trackLength(Scrollbar*);
+
+    virtual void paintScrollCorner(ScrollView*, GraphicsContext*, const IntRect& cornerRect);
+
+protected:
+    virtual bool hasButtons(Scrollbar*) = 0;
+    virtual bool hasThumb(Scrollbar*) = 0;
+
+    virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false) = 0;
+    virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false) = 0;
+    virtual IntRect trackRect(Scrollbar*, bool painting = false) = 0;
+
+    virtual void splitTrack(Scrollbar*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack);
+    
+    virtual int minimumThumbLength(Scrollbar*);
+
+    virtual void paintScrollbarBackground(GraphicsContext*, Scrollbar*) {}
+    virtual void paintTrackBackground(GraphicsContext*, Scrollbar*, const IntRect&) {}
+    virtual void paintTrackPiece(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart) {}
+    virtual void paintButton(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart) {}
+    virtual void paintThumb(GraphicsContext*, Scrollbar*, const IntRect&) {}
+    
+    virtual IntRect constrainTrackRectToTrackPieces(Scrollbar*, const IntRect& rect) { return rect; }
+};
+
+}
+#endif