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diff --git a/Source/WebCore/rendering/RenderMultiColumnBlock.h b/Source/WebCore/rendering/RenderMultiColumnBlock.h
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+++ b/Source/WebCore/rendering/RenderMultiColumnBlock.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. ``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 COMPUTER, 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 RenderMultiColumnBlock_h
+#define RenderMultiColumnBlock_h
+
+#include "RenderBlock.h"
+
+namespace WebCore {
+
+class RenderMultiColumnBlock : public RenderBlock {
+public:
+    RenderMultiColumnBlock(Node*);
+    
+private:
+    virtual const char* renderName() const;
+
+    virtual bool recomputeLogicalWidth();
+    void computeColumnCountAndWidth();
+
+private:
+    unsigned m_columnCount;   // The default column count/width that are based off our containing block width. These values represent only the default,
+    LayoutUnit m_columnWidth; // since a multi-column block that is split across variable width pages or regions will have different column counts and widths in each.
+                              // These values will be cached (eventually) for multi-column blocks.
+};
+
+} // namespace WebCore
+
+#endif // RenderMultiColumnBlock_h
+