[CSS Grid Layout] Avoid using StyleAdjuster to resolve 'auto' values.

Source/core/layout/LayoutBox.cpp

Index: Source/core/layout/LayoutBox.cpp
diff --git a/Source/core/layout/LayoutBox.cpp b/Source/core/layout/LayoutBox.cpp
index 78cc863c00f7c60c6398c8324003374d91bb8047..b7199a19948f93dca28ad8c3654a21fdd91382fb 100644
--- a/Source/core/layout/LayoutBox.cpp
+++ b/Source/core/layout/LayoutBox.cpp
@@ -252,6 +252,7 @@ void LayoutBox::styleDidChange(StyleDifference diff, const ComputedStyle* oldSty
     }
     updateShapeOutsideInfoAfterStyleChange(*style(), oldStyle);
     updateGridPositionAfterStyleChange(oldStyle);
+    updateAlignmentAfterStyleChange(oldStyle);
 
     if (LayoutMultiColumnSpannerPlaceholder* placeholder = this->spannerPlaceholder())
         placeholder->updateMarginProperties();
@@ -299,6 +300,23 @@ void LayoutBox::updateGridPositionAfterStyleChange(const ComputedStyle* oldStyle
     toLayoutGrid(parent())->dirtyGrid();
 }
 
+void LayoutBox::updateAlignmentAfterStyleChange(const ComputedStyle* oldStyle)
+{
+    if (!oldStyle)
+        return;
+
+    // When container's justify-items value changes and the new value containes the 'legacy'
+    // keyword, it will affect children's justify-item 'auto' value resolution.
+    if (oldStyle->justifyItemsPositionType() != styleRef().justifyItemsPositionType()
+        || (styleRef().justifyItemsPositionType() == LegacyPosition && oldStyle->justifyItemsPosition() != styleRef().justifyItemsPosition())) {
+        for (LayoutBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
+            if ((styleRef().justifyItemsPositionType() == LegacyPosition) && (child->styleRef().justifyItemsPosition() == ItemPositionAuto))
+                child->mutableStyleRef().setJustifyItemsPosition(styleRef().justifyItemsPosition());
+            child->setNeedsLayout(LayoutInvalidationReason::GridChanged);
+        }
+    }
+}
+
 void LayoutBox::updateFromStyle()
 {
     LayoutBoxModelObject::updateFromStyle();
@@ -2140,7 +2158,7 @@ static bool columnFlexItemHasStretchAlignment(const LayoutObject* flexitem)
     ASSERT(parent->style()->isColumnFlexDirection());
     if (flexitem->style()->marginStart().isAuto() || flexitem->style()->marginEnd().isAuto())
         return false;
-    return flexitem->style()->alignSelfPosition() == ItemPositionStretch || (flexitem->style()->alignSelfPosition() == ItemPositionAuto && parent->style()->alignItemsPosition() == ItemPositionStretch);
+    return ComputedStyle::resolvedAlignSelfPosition(parent->styleRef(), flexitem->styleRef(), ItemPositionStretch) == ItemPositionStretch;
 }
 
 static bool isStretchingColumnFlexItem(const LayoutObject* flexitem)