[CSS Grid Layout] Implement 'justify-self' 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
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 enum GridAutoFlow { AutoFlowNone, AutoFlowColumn, AutoFlowRow };
 
 enum DraggableRegionMode { DraggableRegionNone, DraggableRegionDrag, DraggableRegionNoDrag };
 
 enum TouchAction { TouchActionAuto, TouchActionNone };
 
 enum EIsolation { IsolationAuto, IsolationIsolate };
 
 enum TouchActionDelay { TouchActionDelayNone, TouchActionDelayScript };
 
+enum JustifySelf {
+    JustifySelfAuto,
+    JustifySelfStretch,
+    JustifySelfBaseline,
+    JustifySelfCenter,
+    JustifySelfStart,
+    JustifySelfEnd,
+    JustifySelfSelfStart,
+    JustifySelfSelfEnd,
+    JustifySelfFlexStart,
+    JustifySelfFlexEnd,
+    JustifySelfLeft,
+    JustifySelfRight
+};
+
+enum JustifySelfOverflowAlignment {
+    JustifySelfOverflowAlignmentDefault,
+    JustifySelfOverflowAlignmentTrue,
+    JustifySelfOverflowAlignmentSafe
+};
+
 // 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 };
 
 } // namespace WebCore
 
 #endif // RenderStyleConstants_h