[CSS Grid Layout] Upgrade justify-content parsing to CSS3 Box Alignment spec.

Source/core/css/CSSValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 84 matching lines @@
     bool isShadowValue() const { return m_classType == ShadowClass; }
     bool isTextCloneCSSValue() const { return m_isTextClone; }
     bool isCubicBezierTimingFunctionValue() const { return m_classType == CubicBezierTimingFunctionClass; }
     bool isStepsTimingFunctionValue() const { return m_classType == StepsTimingFunctionClass; }
     bool isTransformValue() const { return m_classType == CSSTransformClass; }
     bool isLineBoxContainValue() const { return m_classType == LineBoxContainClass; }
     bool isCalcValue() const {return m_classType == CalculationClass; }
     bool isFilterValue() const { return m_classType == CSSFilterClass; }
     bool isGridTemplateAreasValue() const { return m_classType == GridTemplateAreasClass; }
     bool isSVGDocumentValue() const { return m_classType == CSSSVGDocumentClass; }
+    bool isContentDistributionValue() const { return m_classType == CSSContentDistributionClass; }
     bool isUnicodeRangeValue() const { return m_classType == UnicodeRangeClass; }
     bool isGridLineNamesValue() const { return m_classType == GridLineNamesClass; }
 
     bool isCSSOMSafe() const { return m_isCSSOMSafe; }
     bool isSubtypeExposedToCSSOM() const
     {
         return isPrimitiveValue() || isValueList();
     }
 
     PassRefPtrWillBeRawPtr<CSSValue> cloneForCSSOM() const;
@@ skipping 39 matching lines @@
         ReflectClass,
         ShadowClass,
         UnicodeRangeClass,
         LineBoxContainClass,
         CalculationClass,
         GridTemplateAreasClass,
 
         // SVG classes.
         CSSSVGDocumentClass,
 
+        CSSContentDistributionClass,
+
         // List class types must appear after ValueListClass.
         ValueListClass,
         ImageSetClass,
         CSSFilterClass,
         CSSTransformClass,
         GridLineNamesClass,
         // Do not append non-list class types here.
     };
 
     static const size_t ValueListSeparatorBits = 2;
@@ skipping 75 matching lines @@
 {
     return first ? second && first->equals(*second) : !second;
 }
 
 #define DEFINE_CSS_VALUE_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, CSSValue, value, value->predicate, value.predicate)
 
 } // namespace blink
 
 #endif // CSSValue_h