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diff --git a/Source/WebKit/chromium/src/ScrollbarGroup.h b/Source/WebKit/chromium/src/ScrollbarGroup.h
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+++ b/Source/WebKit/chromium/src/ScrollbarGroup.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 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 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 ScrollbarGroup_h
+#define ScrollbarGroup_h
+
+#include "ScrollableArea.h"
+
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+class Page;
+}
+
+namespace WebKit {
+
+class WebScrollbarImpl;
+
+class ScrollbarGroup : public WebCore::ScrollableArea {
+public:
+    explicit ScrollbarGroup(WebCore::Page*);
+    ~ScrollbarGroup();
+
+    void scrollbarCreated(WebScrollbarImpl*);
+    void scrollbarDestroyed(WebScrollbarImpl*);
+    void setLastMousePosition(const WebCore::IntPoint&);
+
+    // WebCore::ScrollableArea methods
+    virtual int scrollSize(WebCore::ScrollbarOrientation) const;
+    virtual int scrollPosition(WebCore::Scrollbar*) const;
+    virtual void setScrollOffset(const WebCore::IntPoint&);
+    virtual void invalidateScrollbarRect(WebCore::Scrollbar*, const WebCore::IntRect&);
+    virtual void invalidateScrollCornerRect(const WebCore::IntRect&);
+    virtual bool isActive() const;
+    virtual ScrollableArea* enclosingScrollableArea() const;
+    virtual WebCore::IntRect scrollCornerRect() const { return WebCore::IntRect(); }
+    virtual bool isScrollCornerVisible() const;
+    virtual void getTickmarks(Vector<WebCore::IntRect>&) const;
+    virtual WebCore::IntPoint convertFromContainingViewToScrollbar(const WebCore::Scrollbar*, const WebCore::IntPoint& parentPoint) const;
+    virtual WebCore::Scrollbar* horizontalScrollbar() const;
+    virtual WebCore::Scrollbar* verticalScrollbar() const;
+    virtual WebCore::IntPoint scrollPosition() const;
+    virtual WebCore::IntPoint minimumScrollPosition() const;
+    virtual WebCore::IntPoint maximumScrollPosition() const;
+    virtual int visibleHeight() const;
+    virtual int visibleWidth() const;
+    virtual WebCore::IntSize contentsSize() const;
+    virtual WebCore::IntSize overhangAmount() const;
+    virtual WebCore::IntPoint currentMousePosition() const;
+    virtual bool shouldSuspendScrollAnimations() const;
+    virtual void scrollbarStyleChanged(int newStyle, bool forceUpdate);
+    virtual bool isOnActivePage() const;
+    virtual void disconnectFromPage();
+
+private:
+    WebCore::Page* m_page;
+    WebCore::IntPoint m_lastMousePosition;
+    WebScrollbarImpl* m_horizontalScrollbar;
+    WebScrollbarImpl* m_verticalScrollbar;
+};
+
+} // namespace WebKit
+
+#endif