[css-grid] Isolate intrinsic size computation from layout

third_party/WebKit/Source/core/layout/LayoutGrid.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 131 matching lines @@
                                                GridSizingData&) const;
 
   size_t computeAutoRepeatTracksCount(GridTrackSizingDirection,
                                       SizingOperation) const;
 
   typedef ListHashSet<size_t> OrderedTrackIndexSet;
   std::unique_ptr<OrderedTrackIndexSet> computeEmptyTracksForAutoRepeat(
       Grid&,
       GridTrackSizingDirection) const;
 
-  void placeItemsOnGrid(Grid&, SizingOperation);
+  void placeItemsOnGrid(Grid&, SizingOperation) const;
   void populateExplicitGridAndOrderIterator(Grid&) const;
   std::unique_ptr<GridArea> createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(
       const Grid&,
       const LayoutBox&,
       GridTrackSizingDirection,
       const GridSpan& specifiedPositions) const;
   void placeSpecifiedMajorAxisItemsOnGrid(Grid&,
                                           const Vector<LayoutBox*>&) const;
   void placeAutoMajorAxisItemsOnGrid(Grid&, const Vector<LayoutBox*>&) const;
   void placeAutoMajorAxisItemOnGrid(
@@ skipping 181 matching lines @@
       GridTrackSizingDirection) const;
 
   bool cachedHasDefiniteLogicalHeight() const;
 
   size_t numTracks(GridTrackSizingDirection, const Grid&) const;
 
   // TODO(svillar): move into this class once GridIterator is added.
   typedef Vector<Vector<GridCell>> GridAsMatrix;
   class Grid final {
    public:
-    Grid(LayoutGrid* grid) : m_orderIterator(grid) {}
+    Grid(const LayoutGrid* grid) : m_orderIterator(grid) {}
 
     size_t numTracks(GridTrackSizingDirection) const;
 
     void ensureGridSize(size_t maximumRowSize, size_t maximumColumnSize);
     void insert(LayoutBox&, const GridArea&);
 
     // Note that out of flow children are not grid items.
     bool hasGridItems() const { return !m_gridItemArea.isEmpty(); }
 
     // TODO(svillar): move this to SizingData once it's passed to
@@ skipping 71 matching lines @@
   LayoutUnit m_maxContentHeight{-1};
 
   Optional<bool> m_hasDefiniteLogicalHeight;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutGrid, isLayoutGrid());
 
 }  // namespace blink
 
 #endif  // LayoutGrid_h