[css-grid] Allow percentage values for column and row gutters

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 190 matching lines @@
     bool allowedToStretchChildAlongRowAxis(const LayoutBox& child) const { return justifySelfForChild(child).position() == ItemPositionStretch && hasAutoSizeInRowAxis(child) && !hasAutoMarginsInRowAxis(child); }
     bool hasAutoMarginsInColumnAxis(const LayoutBox&) const;
     bool hasAutoMarginsInRowAxis(const LayoutBox&) const;
     void updateAutoMarginsInColumnAxisIfNeeded(LayoutBox&);
     void updateAutoMarginsInRowAxisIfNeeded(LayoutBox&);
 
 #if ENABLE(ASSERT)
     bool tracksAreWiderThanMinTrackBreadth(GridTrackSizingDirection, GridSizingData&);
 #endif
 
-    LayoutUnit gridGapForDirection(GridTrackSizingDirection) const;
-    LayoutUnit guttersSize(GridTrackSizingDirection, size_t startLine, size_t span) const;
+    LayoutUnit gridGapForDirection(GridTrackSizingDirection, SizingOperation) const;
+    LayoutUnit guttersSize(GridTrackSizingDirection, size_t startLine, size_t span, SizingOperation) const;
 
     size_t gridItemSpan(const LayoutBox&, GridTrackSizingDirection);
     bool spanningItemCrossesFlexibleSizedTracks(const GridSpan&, GridTrackSizingDirection, SizingOperation) const;
 
     size_t gridColumnCount() const;
     size_t gridRowCount() const;
 
     bool isOrthogonalChild(const LayoutBox&) const;
     GridTrackSizingDirection flowAwareDirectionForChild(const LayoutBox&, GridTrackSizingDirection) const;
 
@@ skipping 22 matching lines @@
 
     std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyColumns { nullptr };
     std::unique_ptr<OrderedTrackIndexSet> m_autoRepeatEmptyRows { nullptr };
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutGrid, isLayoutGrid());
 
 } // namespace blink
 
 #endif // LayoutGrid_h