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diff --git a/Source/WebCore/rendering/RenderRegion.h b/Source/WebCore/rendering/RenderRegion.h
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+++ b/Source/WebCore/rendering/RenderRegion.h
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+/*
+ * Copyright 2011 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER “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 THE COPYRIGHT HOLDER 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 RenderRegion_h
+#define RenderRegion_h
+
+#include "RenderReplaced.h"
+
+namespace WebCore {
+
+class RenderBox;
+class RenderBoxRegionInfo;
+class RenderFlowThread;
+
+class RenderRegion : public RenderReplaced {
+public:
+    explicit RenderRegion(Node*, RenderFlowThread*);
+    virtual ~RenderRegion();
+
+    virtual bool isRenderRegion() const { return true; }
+
+    virtual void paintReplaced(PaintInfo&, const LayoutPoint&);
+    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
+
+    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
+
+    void setRegionRect(const LayoutRect& rect) { m_regionRect = rect; }
+    LayoutRect regionRect() const { return m_regionRect; }
+    LayoutRect regionOverflowRect() const;
+
+    void attachRegion();
+    void detachRegion();
+
+    RenderFlowThread* parentFlowThread() const { return m_parentFlowThread; }
+
+    // Valid regions do not create circular dependencies with other flows.
+    bool isValid() const { return m_isValid; }
+    void setIsValid(bool valid) { m_isValid = valid; }
+
+    bool hasCustomRegionStyle() const { return m_hasCustomRegionStyle; }
+    void setHasCustomRegionStyle(bool hasCustomRegionStyle) { m_hasCustomRegionStyle = hasCustomRegionStyle; }
+
+    virtual void layout();
+
+    RenderBoxRegionInfo* renderBoxRegionInfo(const RenderBox*) const;
+    RenderBoxRegionInfo* setRenderBoxRegionInfo(const RenderBox*, LayoutUnit logicalLeftInset, LayoutUnit logicalRightInset,
+        bool containingBlockChainIsInset);
+    RenderBoxRegionInfo* takeRenderBoxRegionInfo(const RenderBox*);
+    void removeRenderBoxRegionInfo(const RenderBox*);
+
+    void deleteAllRenderBoxRegionInfo();
+
+    LayoutUnit offsetFromLogicalTopOfFirstPage() const;
+
+    bool isFirstRegion() const;
+    bool isLastRegion() const;
+
+private:
+    virtual const char* renderName() const { return "RenderRegion"; }
+
+    RenderFlowThread* m_flowThread;
+
+    // If this RenderRegion is displayed as part of another flow,
+    // we need to create a dependency tree, so that layout of the
+    // regions is always done before the regions themselves.
+    RenderFlowThread* m_parentFlowThread;
+    LayoutRect m_regionRect;
+
+    // This map holds unique information about a block that is split across regions.
+    // A RenderBoxRegionInfo* tells us about any layout information for a RenderBox that
+    // is unique to the region. For now it just holds logical width information for RenderBlocks, but eventually
+    // it will also hold a custom style for any box (for region styling).
+    HashMap<const RenderBox*, RenderBoxRegionInfo*> m_renderBoxRegionInfo;
+
+    bool m_isValid;
+    bool m_hasCustomRegionStyle;
+};
+
+inline RenderRegion* toRenderRegion(RenderObject* object)
+{
+    ASSERT(!object || object->isRenderRegion());
+    return static_cast<RenderRegion*>(object);
+}
+
+inline const RenderRegion* toRenderRegion(const RenderObject* object)
+{
+    ASSERT(!object || object->isRenderRegion());
+    return static_cast<const RenderRegion*>(object);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toRenderRegion(const RenderRegion*);
+
+} // namespace WebCore
+
+#endif // RenderRegion_h