[css-grid] Implement grid gutters

Source/core/style/StyleGridData.h

 /*
  * Copyright (C) 2011 Google 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 28 matching lines @@
 typedef HashMap<String, Vector<size_t>> NamedGridLinesMap;
 typedef HashMap<size_t, Vector<String>, WTF::IntHash<size_t>, WTF::UnsignedWithZeroKeyHashTraits<size_t>> OrderedNamedGridLines;
 
 class StyleGridData : public RefCounted<StyleGridData> {
 public:
     static PassRefPtr<StyleGridData> create() { return adoptRef(new StyleGridData); }
     PassRefPtr<StyleGridData> copy() const { return adoptRef(new StyleGridData(*this)); }
 
     bool operator==(const StyleGridData& o) const
     {
-        return m_gridTemplateColumns == o.m_gridTemplateColumns && m_gridTemplateRows == o.m_gridTemplateRows && m_gridAutoFlow == o.m_gridAutoFlow && m_gridAutoRows == o.m_gridAutoRows && m_gridAutoColumns == o.m_gridAutoColumns && m_namedGridColumnLines == o.m_namedGridColumnLines && m_namedGridRowLines == o.m_namedGridRowLines && m_orderedNamedGridColumnLines == o.m_orderedNamedGridColumnLines && m_orderedNamedGridRowLines == o.m_orderedNamedGridRowLines && m_namedGridArea == o.m_namedGridArea && m_namedGridArea == o.m_namedGridArea && m_namedGridAreaRowCount == o.m_namedGridAreaRowCount && m_namedGridAreaColumnCount == o.m_namedGridAreaColumnCount;
+        return m_gridTemplateColumns == o.m_gridTemplateColumns && m_gridTemplateRows == o.m_gridTemplateRows && m_gridAutoFlow == o.m_gridAutoFlow && m_gridAutoRows == o.m_gridAutoRows && m_gridAutoColumns == o.m_gridAutoColumns && m_namedGridColumnLines == o.m_namedGridColumnLines && m_namedGridRowLines == o.m_namedGridRowLines && m_orderedNamedGridColumnLines == o.m_orderedNamedGridColumnLines && m_orderedNamedGridRowLines == o.m_orderedNamedGridRowLines && m_namedGridArea == o.m_namedGridArea && m_namedGridArea == o.m_namedGridArea && m_namedGridAreaRowCount == o.m_namedGridAreaRowCount && m_namedGridAreaColumnCount == o.m_namedGridAreaColumnCount && m_gridColumnGap == o.m_gridColumnGap && m_gridRowGap == o.m_gridRowGap;
     }
 
     bool operator!=(const StyleGridData& o) const
     {
         return !(*this == o);
     }
 
     Vector<GridTrackSize> m_gridTemplateColumns;
     Vector<GridTrackSize> m_gridTemplateRows;
 
     NamedGridLinesMap m_namedGridColumnLines;
     NamedGridLinesMap m_namedGridRowLines;
 
     // In order to reconstruct the original named grid line order, we can't rely on NamedGridLinesMap
     // as it loses the position if multiple grid lines are set on a single track.
     OrderedNamedGridLines m_orderedNamedGridColumnLines;
     OrderedNamedGridLines m_orderedNamedGridRowLines;
 
     unsigned m_gridAutoFlow : GridAutoFlowBits;
 
     GridTrackSize m_gridAutoRows;
     GridTrackSize m_gridAutoColumns;
 
     NamedGridAreaMap m_namedGridArea;
     // Because m_namedGridArea doesn't store the unnamed grid areas, we need to keep track
     // of the explicit grid size defined by both named and unnamed grid areas.
     size_t m_namedGridAreaRowCount;
     size_t m_namedGridAreaColumnCount;
 
+    Length m_gridColumnGap;
+    Length m_gridRowGap;
+
 private:
     StyleGridData();
     StyleGridData(const StyleGridData&);
 };
 
 } // namespace blink
 
 #endif // StyleGridData_h