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

Source/core/css/resolver/StyleBuilderCustom.cpp

Index: Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/Source/core/css/resolver/StyleBuilderCustom.cpp b/Source/core/css/resolver/StyleBuilderCustom.cpp
index 2b6271c4cec25b0ab1ddbb4174e4ee66068c339f..efaea630e564c58861bfaf2802b690b45282b65d 100644
--- a/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -1865,6 +1865,18 @@ void StyleBuilder::oldApplyProperty(CSSPropertyID id, StyleResolverState& state,
         return;
     }
 
+    case CSSPropertyJustifySelf: {
+        HANDLE_INHERIT_AND_INITIAL(justifySelf, JustifySelf);
+        CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
+        if (Pair* pairValue = primitiveValue->getPairValue()) {
+            state.style()->setJustifySelf(*pairValue->first());
+            state.style()->setJustifySelfOverflowAlignment(*pairValue->second());
+        } else {
+            state.style()->setJustifySelf(*primitiveValue);
+        }
+        return;
+    }
+
     // These properties are aliased and we already applied the property on the prefixed version.
     case CSSPropertyAnimationDelay:
     case CSSPropertyAnimationDirection: