Implement justify-self handling in grid

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 94 matching lines @@
     double computeNormalizedFractionBreadth(Vector<GridTrack>&, GridTrackSizingDirection, LayoutUnit availableLogicalSpace) const;
 
     const GridTrackSize& gridTrackSize(GridTrackSizingDirection, size_t) const;
     size_t explicitGridColumnCount() const;
     size_t explicitGridRowCount() const;
     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&);
+    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;
@@ skipping 29 matching lines @@
     HashMap<const RenderBox*, GridCoordinate> m_gridItemCoordinate;
     OrderIterator m_orderIterator;
     bool m_gridItemOverflowGridArea;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderGrid, isRenderGrid());
 
 } // namespace WebCore
 
 #endif // RenderGrid_h