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diff --git a/Source/WebCore/rendering/RenderFlexibleBox.h b/Source/WebCore/rendering/RenderFlexibleBox.h
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+++ b/Source/WebCore/rendering/RenderFlexibleBox.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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 RenderFlexibleBox_h
+#define RenderFlexibleBox_h
+
+#include "RenderBlock.h"
+
+namespace WebCore {
+
+class RenderFlexibleBox : public RenderBlock {
+public:
+    RenderFlexibleBox(Node*);
+    virtual ~RenderFlexibleBox();
+
+    virtual const char* renderName() const;
+
+    virtual bool isFlexibleBox() const { return true; }
+
+    virtual void layoutBlock(bool relayoutChildren, int pageLogicalHeight = 0, BlockLayoutPass = NormalLayoutPass);
+
+private:
+    class TreeOrderIterator;
+    class FlexOrderIterator;
+    typedef WTF::HashMap<const RenderBox*, LayoutUnit> InflexibleFlexItemSize;
+
+    bool hasOrthogonalFlow(RenderBox* child) const;
+    bool isColumnFlow() const;
+    bool isHorizontalFlow() const;
+    bool isLeftToRightFlow() const;
+    Length crossAxisLength() const;
+    Length mainAxisLengthForChild(RenderBox* child) const;
+    void setCrossAxisExtent(LayoutUnit);
+    LayoutUnit crossAxisExtentForChild(RenderBox* child);
+    LayoutUnit mainAxisExtentForChild(RenderBox* child);
+    LayoutUnit crossAxisExtent() const;
+    LayoutUnit mainAxisExtent() const;
+    LayoutUnit crossAxisContentExtent() const;
+    LayoutUnit mainAxisContentExtent() const;
+    WritingMode transformedWritingMode() const;
+    LayoutUnit flowAwareBorderStart() const;
+    LayoutUnit flowAwareBorderBefore() const;
+    LayoutUnit flowAwareBorderEnd() const;
+    LayoutUnit crossAxisBorderAndPaddingExtent() const;
+    LayoutUnit flowAwarePaddingStart() const;
+    LayoutUnit flowAwarePaddingBefore() const;
+    LayoutUnit flowAwarePaddingEnd() const;
+    LayoutUnit flowAwareMarginStartForChild(RenderBox* child) const;
+    LayoutUnit flowAwareMarginEndForChild(RenderBox* child) const;
+    LayoutUnit flowAwareMarginBeforeForChild(RenderBox* child) const;
+    LayoutUnit flowAwareMarginAfterForChild(RenderBox* child) const;
+    LayoutUnit crossAxisMarginExtentForChild(RenderBox* child) const;
+    LayoutPoint flowAwareLocationForChild(RenderBox* child) const;
+    // FIXME: Supporting layout deltas.
+    void setFlowAwareLocationForChild(RenderBox* child, const LayoutPoint&);
+    void adjustAlignmentForChild(RenderBox* child, LayoutUnit);
+    LayoutUnit mainAxisBorderAndPaddingExtentForChild(RenderBox* child) const;
+    LayoutUnit mainAxisScrollbarExtentForChild(RenderBox* child) const;
+    LayoutUnit preferredMainAxisContentExtentForFlexItem(RenderBox* child) const;
+
+    void layoutFlexItems(bool relayoutChildren);
+
+    float positiveFlexForChild(RenderBox* child) const;
+    float negativeFlexForChild(RenderBox* child) const;
+
+    LayoutUnit availableAlignmentSpaceForChild(RenderBox*);
+    LayoutUnit marginBoxAscent(RenderBox*);
+
+    void computePreferredMainAxisExtent(bool relayoutChildren, TreeOrderIterator&, LayoutUnit&, float& totalPositiveFlexibility, float& totalNegativeFlexibility);
+    bool runFreeSpaceAllocationAlgorithm(FlexOrderIterator&, LayoutUnit& availableFreeSpace, float& totalPositiveFlexibility, float& totalNegativeFlexibility, InflexibleFlexItemSize&, WTF::Vector<LayoutUnit>& childSizes);
+    void setLogicalOverrideSize(RenderBox* child, LayoutUnit childPreferredSize);
+    void layoutAndPlaceChildren(FlexOrderIterator&, const WTF::Vector<LayoutUnit>& childSizes, LayoutUnit availableFreeSpace, float totalPositiveFlexibility);
+    void layoutColumnReverse(FlexOrderIterator&, const WTF::Vector<LayoutUnit>& childSizes, LayoutUnit availableFreeSpace, float totalPositiveFlexibility);
+    void alignChildren(FlexOrderIterator&, LayoutUnit maxAscent);
+};
+
+} // namespace WebCore
+
+#endif // RenderFlexibleBox_h