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diff --git a/Source/WebCore/rendering/RenderSlider.h b/Source/WebCore/rendering/RenderSlider.h
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+++ b/Source/WebCore/rendering/RenderSlider.h
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+/*
+ * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * 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 RenderSlider_h
+#define RenderSlider_h
+
+#include "RenderBlock.h"
+
+namespace WebCore {
+
+    class HTMLInputElement;
+    class MouseEvent;
+    class SliderThumbElement;
+    
+    class RenderSlider : public RenderBlock {
+    public:
+        RenderSlider(HTMLInputElement*);
+        virtual ~RenderSlider();
+
+        bool inDragMode() const;
+        IntRect thumbRect();
+
+    private:
+        virtual const char* renderName() const { return "RenderSlider"; }
+        virtual bool isSlider() const { return true; }
+
+        virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
+        virtual void computePreferredLogicalWidths();
+        virtual void layout();
+
+        // FIXME: Eventually, the logic of manipulating slider thumb should move to
+        // SliderThumbElement and accessing sliderThumbElement should not be necessary in this class.
+        SliderThumbElement* sliderThumbElement() const;
+
+        virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
+    };
+
+    inline RenderSlider* toRenderSlider(RenderObject* object)
+    {
+        ASSERT(!object || object->isSlider());
+        return static_cast<RenderSlider*>(object);
+    }
+
+    // This will catch anyone doing an unnecessary cast.
+    void toRenderSlider(const RenderSlider*);
+
+} // namespace WebCore
+
+#endif // RenderSlider_h