[CSS Grid Layout] Flex tracks sizing alg must handle 0fr values

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 117 matching lines @@
     void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
     void offsetAndBreadthForPositionedChild(const LayoutBox&, GridTrackSizingDirection, bool startIsAuto, bool endIsAuto, LayoutUnit& offset, LayoutUnit& breadth);
     void populateGridPositions(GridSizingData&, LayoutUnit availableSpaceForColumns, LayoutUnit availableSpaceForRows);
 
     typedef struct GridItemsSpanGroupRange GridItemsSpanGroupRange;
     LayoutUnit currentItemSizeForTrackSizeComputationPhase(TrackSizeComputationPhase, LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     void resolveContentBasedTrackSizingFunctionsForNonSpanningItems(GridTrackSizingDirection, const GridCoordinate&, LayoutBox& gridItem, GridTrack&, Vector<GridTrack>& columnTracks);
     template <TrackSizeComputationPhase> void resolveContentBasedTrackSizingFunctionsForItems(GridTrackSizingDirection, GridSizingData&, const GridItemsSpanGroupRange&);
     template <TrackSizeComputationPhase> void distributeSpaceToTracks(Vector<GridTrack*>&, const Vector<GridTrack*>* growBeyondGrowthLimitsTracks, GridSizingData&, LayoutUnit& availableLogicalSpace);
 
-    double computeNormalizedFractionBreadth(Vector<GridTrack>&, const GridSpan& tracksSpan, GridTrackSizingDirection, LayoutUnit availableLogicalSpace) const;
+    typedef HashSet<size_t, DefaultHash<size_t>::Hash, WTF::UnsignedWithZeroKeyHashTraits<size_t>> TrackIndexSet;
+    double computeFlexFactorUnitSize(const Vector<GridTrack>&, GridTrackSizingDirection, double flexFactorSum, LayoutUnit& leftOverSpace, const Vector<size_t, 8>& flexibleTracksIndexes, PassOwnPtr<TrackIndexSet> tracksToTreatAsInflexible = nullptr) const;
+    double findFlexFactorUnitSize(const Vector<GridTrack>&, const GridSpan&, GridTrackSizingDirection, LayoutUnit leftOverSpace) const;
 
     GridTrackSize gridTrackSize(GridTrackSizingDirection, size_t) const;
 
     LayoutUnit logicalHeightForChild(LayoutBox&, Vector<GridTrack>&);
     LayoutUnit minSizeForChild(LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     LayoutUnit minContentForChild(LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     LayoutUnit maxContentForChild(LayoutBox&, GridTrackSizingDirection, Vector<GridTrack>& columnTracks);
     GridAxisPosition columnAxisPositionForChild(const LayoutBox&) const;
     GridAxisPosition rowAxisPositionForChild(const LayoutBox&) const;
     LayoutUnit rowAxisOffsetForChild(const LayoutBox&) const;
@@ skipping 47 matching lines @@
     OrderIterator m_orderIterator;
     Vector<LayoutBox*> m_gridItemsOverflowingGridArea;
     HashMap<const LayoutBox*, size_t> m_gridItemsIndexesMap;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutGrid, isLayoutGrid());
 
 } // namespace blink
 
 #endif // LayoutGrid_h