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

third_party/WebKit/Source/core/layout/LayoutGrid.h

Index: third_party/WebKit/Source/core/layout/LayoutGrid.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutGrid.h b/third_party/WebKit/Source/core/layout/LayoutGrid.h
index bed3459ce4b8874b18fee9800895e8c31ffe75a3..fb9ae43eaf3c8a0ca704987e3add8ebc39c9531c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutGrid.h
+++ b/third_party/WebKit/Source/core/layout/LayoutGrid.h
@@ -59,6 +59,8 @@ public:
 
     void dirtyGrid();
 
+    Vector<LayoutUnit> trackSizesForComputedStyle(GridTrackSizingDirection) const;
+
     const Vector<LayoutUnit>& columnPositions() const
     {
         ASSERT(!m_gridIsDirty);
@@ -71,13 +73,6 @@ public:
         return m_rowPositions;
     }
 
-    LayoutUnit guttersSize(GridTrackSizingDirection, size_t span) const;
-
-    LayoutUnit offsetBetweenTracks(GridTrackSizingDirection direction) const
-    {
-        return direction == ForColumns ? m_offsetBetweenColumns : m_offsetBetweenRows;
-    }
-
     typedef Vector<LayoutBox*, 1> GridCell;
     const GridCell& gridCell(int row, int column) const
     {
@@ -131,6 +126,12 @@ private:
 
     size_t computeAutoRepeatTracksCount(GridTrackSizingDirection) const;
 
+    typedef ListHashSet<size_t> OrderedTrackIndexSet;
+    std::unique_ptr<OrderedTrackIndexSet> computeEmptyTracksForAutoRepeat(GridTrackSizingDirection) const;
+
+    bool hasAutoRepeatEmptyTracks(GridTrackSizingDirection) const;
+    bool isEmptyAutoRepeatTrack(GridTrackSizingDirection, size_t lineNumber) const;
+
     void placeItemsOnGrid(SizingOperation);
     void populateExplicitGridAndOrderIterator();
     std::unique_ptr<GridArea> createEmptyGridAreaAtSpecifiedPositionsOutsideGrid(const LayoutBox&, GridTrackSizingDirection, const GridSpan& specifiedPositions) const;
@@ -200,6 +201,9 @@ private:
     bool tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection, GridSizingData&);
 #endif
 
+    LayoutUnit gridGapForDirection(GridTrackSizingDirection) const;
+    LayoutUnit guttersSize(GridTrackSizingDirection, size_t startLine, size_t span) const;
+
     size_t gridItemSpan(const LayoutBox&, GridTrackSizingDirection);
     bool spanningItemCrossesFlexibleSizedTracks(const GridSpan&, GridTrackSizingDirection, SizingOperation) const;
 
@@ -231,6 +235,9 @@ private:
     size_t m_autoRepeatRows { 0 };
 
     bool m_hasAnyOrthogonalChild;
+
+    std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyColumns { nullptr };
+    std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyRows { nullptr };
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutGrid, isLayoutGrid());