[CSS Grid Layout] 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 106 matching lines @@
     LayoutUnit columnPositionAlignedWithGridContainerStart(const RenderBox*) const;
     LayoutUnit columnPositionAlignedWithGridContainerEnd(const RenderBox*) const;
     LayoutUnit centeredColumnPositionForChild(const RenderBox*) const;
     LayoutUnit columnPositionForChild(const RenderBox*) const;
     LayoutUnit rowPositionForChild(const RenderBox*) const;
     LayoutPoint findChildLogicalPosition(const RenderBox*) const;
     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;
 
     bool gridIsDirty() const { return m_gridIsDirty; }
 
 #ifndef NDEBUG
     bool tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection, const Vector<GridTrack>&);
 #endif
@@ skipping 20 matching lines @@
     Vector<RenderBox*> m_gridItemsOverflowingGridArea;
 
     friend class GridCoordinateSorter;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderGrid, isRenderGrid());
 
 } // namespace WebCore
 
 #endif // RenderGrid_h