[CSS Grid] Introduce an explicit type for resolved grid positions

Source/core/rendering/RenderGrid.h

 /*
  * Copyright (C) 2011 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
@@ skipping 10 matching lines @@
  * 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 RenderGrid_h
 #define RenderGrid_h
 
 #include "core/rendering/OrderIterator.h"
 #include "core/rendering/RenderBlock.h"
+#include "core/rendering/style/GridResolvedPosition.h"
 
 namespace WebCore {
 
 struct GridCoordinate;
 struct GridSpan;
 class GridTrack;
 
 enum GridTrackSizingDirection {
     ForColumns,
     ForRows
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     size_t explicitGridSizeForSide(GridPositionSide) const;
 
     LayoutUnit logicalContentHeightForChild(RenderBox*, Vector<GridTrack>&);
     LayoutUnit minContentForChild(RenderBox*, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     LayoutUnit maxContentForChild(RenderBox*, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     LayoutPoint findChildLogicalPosition(RenderBox*, const GridSizingData&);
     GridCoordinate cachedGridCoordinate(const RenderBox*) const;
 
     GridSpan resolveGridPositionsFromAutoPlacementPosition(const RenderBox*, GridTrackSizingDirection, size_t) const;
     PassOwnPtr<GridSpan> resolveGridPositionsFromStyle(const RenderBox*, GridTrackSizingDirection) const;
-    size_t resolveNamedGridLinePositionFromStyle(const GridPosition&, GridPositionSide) const;
-    size_t resolveGridPositionFromStyle(const GridPosition&, GridPositionSide) const;
-    PassOwnPtr<GridSpan> resolveGridPositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition&, GridPositionSide) const;
-    PassOwnPtr<GridSpan> resolveNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition&, GridPositionSide) const;
-    PassOwnPtr<GridSpan> resolveBeforeStartNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition&, const Vector<size_t>&) const;
-    PassOwnPtr<GridSpan> resolveAfterEndNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition&, const Vector<size_t>&) const;
+    GridResolvedPosition resolveNamedGridLinePositionFromStyle(const GridPosition&, GridPositionSide) const;
+    GridResolvedPosition resolveGridPositionFromStyle(const GridPosition&, GridPositionSide) const;
+    PassOwnPtr<GridSpan> resolveGridPositionAgainstOppositePosition(const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide) const;
+    PassOwnPtr<GridSpan> resolveNamedGridLinePositionAgainstOppositePosition(const GridResolvedPosition& resolvedOppositePosition, const GridPosition&, GridPositionSide) const;
 
     LayoutUnit gridAreaBreadthForChild(const RenderBox* child, GridTrackSizingDirection, const Vector<GridTrack>&) const;
 
     virtual void paintChildren(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL;
     void paintChildrenSlowCase(PaintInfo&, const LayoutPoint&);
 
     bool gridIsDirty() const { return m_gridIsDirty; }
 
 #ifndef NDEBUG
     bool tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection, const Vector<GridTrack>&);
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     HashMap<const RenderBox*, GridCoordinate> m_gridItemCoordinate;
     OrderIterator m_orderIterator;
     bool m_gridItemOverflowGridArea;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderGrid, isRenderGrid());
 
 } // namespace WebCore
 
 #endif // RenderGrid_h