[CSS Grid Layout] Implement 'justify-items' parsing

Source/core/rendering/style/RenderStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 509 matching lines @@
 inline TouchAction& operator&= (TouchAction& a, TouchAction b) { return a = a & b; }
 
 enum EIsolation { IsolationAuto, IsolationIsolate };
 
 enum TouchActionDelay { TouchActionDelayNone, TouchActionDelayScript };
 
 enum ItemPosition {
     ItemPositionAuto,
     ItemPositionStretch,
     ItemPositionBaseline,
+    ItemPositionLastBaseline,
     ItemPositionCenter,
     ItemPositionStart,
     ItemPositionEnd,
     ItemPositionSelfStart,
     ItemPositionSelfEnd,
     ItemPositionFlexStart,
     ItemPositionFlexEnd,
     ItemPositionLeft,
     ItemPositionRight
 };
 
 enum OverflowAlignment {
     OverflowAlignmentDefault,
     OverflowAlignmentTrue,
     OverflowAlignmentSafe
 };
 
+enum ItemPositionType {
+    NonLegacyPosition,
+    LegacyPosition
+};
+
 // Reasonable maximum to prevent insane font sizes from causing crashes on some platforms (such as Windows).
 static const float maximumAllowedFontSize = 1000000.0f;
 
 enum TextIndentLine { TextIndentFirstLine, TextIndentEachLine };
 enum TextIndentType { TextIndentNormal, TextIndentHanging };
 
 enum CSSBoxType { BoxMissing = 0, MarginBox, BorderBox, PaddingBox, ContentBox };
 
 } // namespace WebCore
 
 #endif // RenderStyleConstants_h