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diff --git a/webkit/port/platform/chromium/ScrollbarThemeChromium.h b/webkit/port/platform/chromium/ScrollbarThemeChromium.h
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+++ b/webkit/port/platform/chromium/ScrollbarThemeChromium.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 ScrollbarThemeChromium_h
+#define ScrollbarThemeChromium_h
+
+#include "ScrollbarThemeComposite.h"
+
+namespace WebCore {
+
+class PlatformMouseEvent;
+
+// -----------------------------------------------------------------------------
+// This class contains the Chromium scrollbar implementations for Windows and
+// Linux. All of the symbols here in must be defined somewhere in the code and
+// we manage the platform specific parts by linking in different, platform
+// specific, files. Methods that we shared across platforms are implemented in
+// ScrollbarThemeChromium.cpp
+// -----------------------------------------------------------------------------
+class ScrollbarThemeChromium : public ScrollbarThemeComposite {
+public:
+    ScrollbarThemeChromium();
+    virtual ~ScrollbarThemeChromium();
+
+    virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar);
+
+    virtual void themeChanged();
+    
+    virtual bool invalidateOnMouseEnterExit();
+
+protected:
+    virtual bool hasButtons(Scrollbar*) { return true; }
+    virtual bool hasThumb(Scrollbar*);
+
+    virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
+    virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
+    virtual IntRect trackRect(Scrollbar*, bool painting = false);
+
+    virtual void paintScrollCorner(ScrollView*, GraphicsContext*, const IntRect&);
+    virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&);
+
+    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&);
+
+private:
+    IntSize buttonSize(Scrollbar*);
+
+    int getThemeState(Scrollbar*, ScrollbarPart) const;
+    int getThemeArrowState(Scrollbar*, ScrollbarPart) const;
+    int getClassicThemeState(Scrollbar*, ScrollbarPart) const;
+};
+
+}
+#endif