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diff --git a/Source/WebCore/rendering/LayoutState.h b/Source/WebCore/rendering/LayoutState.h
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+/*
+ * Copyright (C) 2007 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 LayoutState_h
+#define LayoutState_h
+
+#include "IntRect.h"
+#include "IntSize.h"
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class ColumnInfo;
+class RenderArena;
+class RenderBox;
+class RenderObject;
+
+class LayoutState : public Noncopyable {
+public:
+    LayoutState()
+        : m_clipped(false)
+        , m_pageLogicalHeight(0)
+        , m_pageLogicalHeightChanged(false)
+        , m_columnInfo(0)
+        , m_next(0)
+#ifndef NDEBUG
+        , m_renderer(0)
+#endif
+    {
+    }
+
+    LayoutState(LayoutState*, RenderBox*, const IntSize& offset, int pageHeight, bool pageHeightChanged, ColumnInfo*);
+    LayoutState(RenderObject*);
+
+    void destroy(RenderArena*);
+
+    // Overloaded new operator.
+    void* operator new(size_t, RenderArena*) throw();
+
+    // Overridden to prevent the normal delete from being called.
+    void operator delete(void*, size_t);
+
+    void clearPaginationInformation();
+    bool isPaginatingColumns() const { return m_columnInfo; }
+    bool isPaginated() const { return m_pageLogicalHeight || m_columnInfo; }
+    
+    // The page logical offset is the object's offset from the top of the page in the page progression
+    // direction (so an x-offset in vertical text and a y-offset for horizontal text).
+    int pageLogicalOffset(int childLogicalOffset) const;
+
+    void addForcedColumnBreak(int childY);
+    
+    bool pageLogicalHeight() const { return m_pageLogicalHeight; }
+    bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
+
+private:
+    // The normal operator new is disallowed.
+    void* operator new(size_t) throw();
+
+public:
+    bool m_clipped;
+    IntRect m_clipRect;
+    IntSize m_paintOffset; // x/y offset from container.  Includes relative positioning and scroll offsets.
+    IntSize m_layoutOffset; // x/y offset from container.  Does not include relative positioning or scroll offsets.
+    IntSize m_layoutDelta; // Transient offset from the final position of the object
+                           // used to ensure that repaints happen in the correct place.
+                           // This is a total delta accumulated from the root.
+
+    int m_pageLogicalHeight; // The current page height for the pagination model that encloses us.
+    bool m_pageLogicalHeightChanged; // If our page height has changed, this will force all blocks to relayout.
+    IntSize m_pageOffset; // The offset of the start of the first page in the nearest enclosing pagination model.
+    ColumnInfo* m_columnInfo; // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
+
+    LayoutState* m_next;
+#ifndef NDEBUG
+    RenderObject* m_renderer;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // LayoutState_h