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

Source/core/rendering/style/StyleRareNonInheritedData.cpp

Index: Source/core/rendering/style/StyleRareNonInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareNonInheritedData.cpp b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
index 165edc705a4c6ac30602220bc0c1c88fa7d7d2f8..884723e1f9b0f98ba45db6bad9f7f10a28415dff 100644
--- a/Source/core/rendering/style/StyleRareNonInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
@@ -87,6 +87,9 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
     , m_touchAction(RenderStyle::initialTouchAction())
     , m_objectFit(RenderStyle::initialObjectFit())
     , m_isolation(RenderStyle::initialIsolation())
+    , m_justifyItems(RenderStyle::initialJustifyItems())
+    , m_justifyItemsOverflowAlignment(RenderStyle::initialJustifyItemsOverflowAlignment())
+    , m_justifyItemsPositionType(NonLegacyPosition)
     , m_justifySelf(RenderStyle::initialJustifySelf())
     , m_justifySelfOverflowAlignment(RenderStyle::initialJustifySelfOverflowAlignment())
     , m_scrollBehavior(RenderStyle::initialScrollBehavior())
@@ -167,6 +170,9 @@ StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonInherited
     , m_touchAction(o.m_touchAction)
     , m_objectFit(o.m_objectFit)
     , m_isolation(o.m_isolation)
+    , m_justifyItems(o.m_justifyItems)
+    , m_justifyItemsOverflowAlignment(o.m_justifyItemsOverflowAlignment)
+    , m_justifyItemsPositionType(o.m_justifyItemsPositionType)
     , m_justifySelf(o.m_justifySelf)
     , m_justifySelfOverflowAlignment(o.m_justifySelfOverflowAlignment)
     , m_scrollBehavior(o.m_scrollBehavior)
@@ -251,6 +257,9 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
         && m_touchAction == o.m_touchAction
         && m_objectFit == o.m_objectFit
         && m_isolation == o.m_isolation
+        && m_justifyItems == o.m_justifyItems
+        && m_justifyItemsOverflowAlignment == o.m_justifyItemsOverflowAlignment
+        && m_justifyItemsPositionType == o.m_justifyItemsPositionType
         && m_justifySelf == o.m_justifySelf
         && m_justifySelfOverflowAlignment == o.m_justifySelfOverflowAlignment
         && m_scrollBehavior == o.m_scrollBehavior