[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 335e18ba7bc5ad3b2c541f0ef8b5eab0e9b85a42..b76730cdd7f894e25a67712bbede2a11b4d05ff4 100644
--- a/third_party/WebKit/Source/core/layout/LayoutGrid.h
+++ b/third_party/WebKit/Source/core/layout/LayoutGrid.h
@@ -130,6 +130,9 @@ private:
 
     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;
@@ -225,6 +228,9 @@ private:
 
     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());