[CSS Grid Layout] Refactoring of grid's alignment logic

Source/core/layout/LayoutGrid.h

Index: Source/core/layout/LayoutGrid.h
diff --git a/Source/core/layout/LayoutGrid.h b/Source/core/layout/LayoutGrid.h
index e26f163760f510b3d58ffb310747f1ac82081d33..6328f08b48171399bf2e875dc364dffa98c7e6ad 100644
--- a/Source/core/layout/LayoutGrid.h
+++ b/Source/core/layout/LayoutGrid.h
@@ -37,6 +37,8 @@ struct GridSpan;
 class GridTrack;
 class GridItemWithSpan;
 
+enum GridAxisPosition {GridAxisStart, GridAxisEnd, GridAxisCenter};
+
 class LayoutGrid final : public LayoutBlock {
 public:
     LayoutGrid(Element*);
@@ -114,15 +116,9 @@ private:
     LayoutUnit logicalHeightForChild(LayoutBox&, Vector<GridTrack>&);
     LayoutUnit minContentForChild(LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     LayoutUnit maxContentForChild(LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
-    LayoutUnit startOfColumnForChild(const LayoutBox& child) const;
-    LayoutUnit endOfColumnForChild(const LayoutBox& child) const;
-    LayoutUnit columnPositionLeft(const LayoutBox&) const;
-    LayoutUnit columnPositionRight(const LayoutBox&) const;
-    LayoutUnit centeredColumnPositionForChild(const LayoutBox&) const;
+    GridAxisPosition columnAxisPositionForChild(const LayoutBox&) const;
+    GridAxisPosition rowAxisPositionForChild(const LayoutBox&) const;
     LayoutUnit columnPositionForChild(const LayoutBox&) const;
-    LayoutUnit startOfRowForChild(const LayoutBox& child) const;
-    LayoutUnit endOfRowForChild(const LayoutBox& child) const;
-    LayoutUnit centeredRowPositionForChild(const LayoutBox&) const;
     LayoutUnit rowPositionForChild(const LayoutBox&) const;
     void computeContentPositionAndDistributionRowOffset(LayoutUnit availableFreeSpace, GridSizingData&) const;
     void computeContentPositionAndDistributionColumnOffset(LayoutUnit availableFreeSpace, GridSizingData&) const;