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

Source/core/css/CSSValue.cpp

Index: Source/core/css/CSSValue.cpp
diff --git a/Source/core/css/CSSValue.cpp b/Source/core/css/CSSValue.cpp
index c04db5a9348c6783bb2a086b4c45f980c40245b7..9ff920057764a2d9a02ea17e1cd37c4ad70e812f 100644
--- a/Source/core/css/CSSValue.cpp
+++ b/Source/core/css/CSSValue.cpp
@@ -30,6 +30,7 @@
 #include "core/css/CSSBorderImageSliceValue.h"
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSCanvasValue.h"
+#include "core/css/CSSContentDistributionValue.h"
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSCursorImageValue.h"
 #include "core/css/CSSFilterValue.h"
@@ -209,6 +210,8 @@ bool CSSValue::equals(const CSSValue& other) const
             return compareCSSValues<CSSFilterValue>(*this, other);
         case CSSSVGDocumentClass:
             return compareCSSValues<CSSSVGDocumentValue>(*this, other);
+        case CSSContentDistributionClass:
+            return compareCSSValues<CSSContentDistributionValue>(*this, other);
         default:
             ASSERT_NOT_REACHED();
             return false;
@@ -285,6 +288,8 @@ String CSSValue::cssText() const
         return toCSSFilterValue(this)->customCSSText();
     case CSSSVGDocumentClass:
         return toCSSSVGDocumentValue(this)->customCSSText();
+    case CSSContentDistributionClass:
+        return toCSSContentDistributionValue(this)->customCSSText();
     }
     ASSERT_NOT_REACHED();
     return String();
@@ -383,6 +388,8 @@ void CSSValue::destroy()
         return;
     case CSSSVGDocumentClass:
         delete toCSSSVGDocumentValue(this);
+    case CSSContentDistributionClass:
+        delete toCSSContentDistributionValue(this);
         return;
     }
     ASSERT_NOT_REACHED();
@@ -482,6 +489,9 @@ void CSSValue::finalizeGarbageCollectedObject()
     case CSSSVGDocumentClass:
         toCSSSVGDocumentValue(this)->~CSSSVGDocumentValue();
         return;
+    case CSSContentDistributionClass:
+        toCSSContentDistributionValue(this)->~CSSContentDistributionValue();
+        return;
     }
     ASSERT_NOT_REACHED();
 }
@@ -580,6 +590,9 @@ void CSSValue::trace(Visitor* visitor)
     case CSSSVGDocumentClass:
         toCSSSVGDocumentValue(this)->traceAfterDispatch(visitor);
         return;
+    case CSSContentDistributionClass:
+        toCSSContentDistributionValue(this)->traceAfterDispatch(visitor);
+        return;
     }
     ASSERT_NOT_REACHED();
 }