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diff --git a/Source/WebCore/rendering/Grid.h b/Source/WebCore/rendering/Grid.h
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+/*
+ * Copyright (C) 2017 Igalia S.L.
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "GridPositionsResolver.h"
+#include "OrderIterator.h"
+#include <wtf/HashMap.h>
+#include <wtf/ListHashSet.h>
+
+namespace WebCore {
+
+typedef Vector<RenderBox*, 1> GridCell;
+typedef Vector<Vector<GridCell>> GridAsMatrix;
+typedef ListHashSet<size_t> OrderedTrackIndexSet;
+
+class GridArea;
+class GridPositionsResolver;
+class RenderGrid;
+
+class Grid final {
+public:
+    explicit Grid(RenderGrid&);
+
+    unsigned numTracks(GridTrackSizingDirection) const;
+
+    void ensureGridSize(unsigned maximumRowSize, unsigned maximumColumnSize);
+    void insert(RenderBox&, const GridArea&);
+
+    // Note that each in flow child of a grid container becomes a grid item. This means that
+    // this method will return false for a grid container with only out of flow children.
+    bool hasGridItems() const { return !m_gridItemArea.isEmpty(); }
+
+    // FIXME: move this to SizingData once placeItemsOnGrid() takes it as argument.
+    bool hasAnyOrthogonalGridItem() const { return m_hasAnyOrthogonalGridItem; }
+    void setHasAnyOrthogonalGridItem(bool hasAnyOrthogonalGridItem) { m_hasAnyOrthogonalGridItem = hasAnyOrthogonalGridItem; }
+
+    GridArea gridItemArea(const RenderBox& item) const;
+    void setGridItemArea(const RenderBox& item, GridArea);
+
+    GridSpan gridItemSpan(const RenderBox&, GridTrackSizingDirection) const;
+
+    const GridCell& cell(unsigned row, unsigned column) const { return m_grid[row][column]; }
+
+    int smallestTrackStart(GridTrackSizingDirection) const;
+    void setSmallestTracksStart(int rowStart, int columnStart);
+
+    unsigned autoRepeatTracks(GridTrackSizingDirection) const;
+    void setAutoRepeatTracks(unsigned autoRepeatRows, unsigned autoRepeatColumns);
+
+    void setAutoRepeatEmptyColumns(std::unique_ptr<OrderedTrackIndexSet>);
+    void setAutoRepeatEmptyRows(std::unique_ptr<OrderedTrackIndexSet>);
+
+    unsigned autoRepeatEmptyTracksCount(GridTrackSizingDirection) const;
+    bool hasAutoRepeatEmptyTracks(GridTrackSizingDirection) const;
+    bool isEmptyAutoRepeatTrack(GridTrackSizingDirection, unsigned) const;
+
+    OrderedTrackIndexSet* autoRepeatEmptyTracks(GridTrackSizingDirection) const;
+
+    OrderIterator& orderIterator() { return m_orderIterator; }
+
+    void setNeedsItemsPlacement(bool);
+    bool needsItemsPlacement() const { return m_needsItemsPlacement; };
+
+private:
+    friend class GridIterator;
+
+    OrderIterator m_orderIterator;
+
+    int m_smallestColumnStart { 0 };
+    int m_smallestRowStart { 0 };
+
+    unsigned m_autoRepeatColumns { 0 };
+    unsigned m_autoRepeatRows { 0 };
+
+    bool m_hasAnyOrthogonalGridItem { false };
+    bool m_needsItemsPlacement { true };
+
+    GridAsMatrix m_grid;
+
+    HashMap<const RenderBox*, GridArea> m_gridItemArea;
+    HashMap<const RenderBox*, size_t> m_gridItemsIndexesMap;
+
+    std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyColumns;
+    std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyRows;
+};
+
+class GridIterator {
+    WTF_MAKE_NONCOPYABLE(GridIterator);
+public:
+    // |direction| is the direction that is fixed to |fixedTrackIndex| so e.g
+    // GridIterator(m_grid, ForColumns, 1) will walk over the rows of the 2nd column.
+    GridIterator(const Grid&, GridTrackSizingDirection, unsigned fixedTrackIndex, unsigned varyingTrackIndex = 0);
+
+    RenderBox* nextGridItem();
+    bool isEmptyAreaEnough(unsigned rowSpan, unsigned columnSpan) const;
+    std::unique_ptr<GridArea> nextEmptyGridArea(unsigned fixedTrackSpan, unsigned varyingTrackSpan);
+
+private:
+    const GridAsMatrix& m_grid;
+    GridTrackSizingDirection m_direction;
+    unsigned m_rowIndex;
+    unsigned m_columnIndex;
+    unsigned m_childIndex;
+};
+
+} // namespace WebCore