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

Source/core/rendering/style/RenderStyle.h

Index: Source/core/rendering/style/RenderStyle.h
diff --git a/Source/core/rendering/style/RenderStyle.h b/Source/core/rendering/style/RenderStyle.h
index 436a4d5fffca0adf66823c32926934ed90db526a..ed43caf16d17e3cd47ffdd10de5ac884d1269637 100644
--- a/Source/core/rendering/style/RenderStyle.h
+++ b/Source/core/rendering/style/RenderStyle.h
@@ -785,6 +785,9 @@ public:
     bool isReverseFlexDirection() const { return flexDirection() == FlowRowReverse || flexDirection() == FlowColumnReverse; }
     EFlexWrap flexWrap() const { return static_cast<EFlexWrap>(rareNonInheritedData->m_flexibleBox->m_flexWrap); }
     EJustifyContent justifyContent() const { return static_cast<EJustifyContent>(rareNonInheritedData->m_justifyContent); }
+    ItemPosition justifyItems() const { return static_cast<ItemPosition>(rareNonInheritedData->m_justifyItems); }
+    OverflowAlignment justifyItemsOverflowAlignment() const { return static_cast<OverflowAlignment>(rareNonInheritedData->m_justifyItemsOverflowAlignment); }
+    bool justifyItemsIsLegacy() const { return rareNonInheritedData->m_justifyItemsIsLegacy; }
     ItemPosition justifySelf() const { return static_cast<ItemPosition>(rareNonInheritedData->m_justifySelf); }
     OverflowAlignment justifySelfOverflowAlignment() const { return static_cast<OverflowAlignment>(rareNonInheritedData->m_justifySelfOverflowAlignment); }
 
@@ -1264,6 +1267,9 @@ public:
     void setFlexDirection(EFlexDirection direction) { SET_VAR(rareNonInheritedData.access()->m_flexibleBox, m_flexDirection, direction); }
     void setFlexWrap(EFlexWrap w) { SET_VAR(rareNonInheritedData.access()->m_flexibleBox, m_flexWrap, w); }
     void setJustifyContent(EJustifyContent p) { SET_VAR(rareNonInheritedData, m_justifyContent, p); }
+    void setJustifyItems(ItemPosition justifyItems) { SET_VAR(rareNonInheritedData, m_justifyItems, justifyItems); }
+    void setJustifyItemsOverflowAlignment(OverflowAlignment overflowAlignment) { SET_VAR(rareNonInheritedData, m_justifyItemsOverflowAlignment, overflowAlignment); }
+    void setJustifyItemsIsLegacy(bool isLegacy) { SET_VAR(rareNonInheritedData, m_justifyItemsIsLegacy, isLegacy); }
     void setJustifySelf(ItemPosition justifySelf) { SET_VAR(rareNonInheritedData, m_justifySelf, justifySelf); }
     void setJustifySelfOverflowAlignment(OverflowAlignment overflowAlignment) { SET_VAR(rareNonInheritedData, m_justifySelfOverflowAlignment, overflowAlignment); }
     void setGridAutoColumns(const GridTrackSize& length) { SET_VAR(rareNonInheritedData.access()->m_grid, m_gridAutoColumns, length); }
@@ -1602,6 +1608,8 @@ public:
     static EFlexDirection initialFlexDirection() { return FlowRow; }
     static EFlexWrap initialFlexWrap() { return FlexNoWrap; }
     static EJustifyContent initialJustifyContent() { return JustifyFlexStart; }
+    static ItemPosition initialJustifyItems() { return ItemPositionAuto; }
+    static OverflowAlignment initialJustifyItemsOverflowAlignment() { return OverflowAlignmentDefault; }
     static ItemPosition initialJustifySelf() { return ItemPositionAuto; }
     static OverflowAlignment initialJustifySelfOverflowAlignment() { return OverflowAlignmentDefault; }
     static int initialMarqueeLoopCount() { return -1; }