[css-grid] Implement repeat(auto-fit)

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 112 matching lines @@
     void computeUsedBreadthOfGridTracks(GridTrackSizingDirection, GridSizingData&, LayoutUnit& baseSizesWithoutMaximization, LayoutUnit& growthLimitsWithoutMaximization);
     LayoutUnit computeUsedBreadthOfMinLength(const GridLength&, LayoutUnit maxBreadth) const;
     LayoutUnit computeUsedBreadthOfMaxLength(const GridLength&, LayoutUnit usedBreadth, LayoutUnit maxBreadth) const;
     void resolveContentBasedTrackSizingFunctions(GridTrackSizingDirection, GridSizingData&);
 
     void ensureGridSize(size_t maximumRowSize, size_t maximumColumnSize);
     void insertItemIntoGrid(LayoutBox&, const GridArea&);
 
     size_t computeAutoRepeatTracksCount(GridTrackSizingDirection) const;
 
+    std::unique_ptr<Vector<size_t>> computeEmptyTracksCountForAutoRepeat(GridTrackSizingDirection, size_t insertionPoint) const;
+    size_t droppedTracksBeforeLine(GridTrackSizingDirection, size_t startLine) const;
+
     void placeItemsOnGrid();
     void populateExplicitGridAndOrderIterator();
     PassOwnPtr<GridArea> createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(const LayoutBox&, GridTrackSizingDirection, const GridSpan& specifiedPositions) const;
     void placeSpecifiedMajorAxisItemsOnGrid(const Vector<LayoutBox*>&);
     void placeAutoMajorAxisItemsOnGrid(const Vector<LayoutBox*>&);
     void placeAutoMajorAxisItemOnGrid(LayoutBox&, std::pair<size_t, size_t>& autoPlacementCursor);
     GridTrackSizingDirection autoPlacementMajorAxisDirection() const;
     GridTrackSizingDirection autoPlacementMinorAxisDirection() const;
 
     void computeIntrinsicLogicalHeight(GridSizingData&);
@@ skipping 75 matching lines @@
     HashMap<const LayoutBox*, size_t> m_gridItemsIndexesMap;
 
     LayoutUnit m_minContentHeight { -1 };
     LayoutUnit m_maxContentHeight { -1 };
 
     int m_smallestRowStart;
     int m_smallestColumnStart;
 
     size_t m_autoRepeatColumns { 0 };
     size_t m_autoRepeatRows { 0 };
+
+    std::unique_ptr<Vector<size_t>> m_emptyColumnsCounter { nullptr };
+    std::unique_ptr<Vector<size_t>> m_emptyRowsCounter { nullptr };
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutGrid, isLayoutGrid());
 
 } // namespace blink
 
 #endif // LayoutGrid_h