[CSS Grid Layout] Don't resolve align-self and justify-self properties

Source/core/css/resolver/StyleAdjuster.cpp

Index: Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/Source/core/css/resolver/StyleAdjuster.cpp b/Source/core/css/resolver/StyleAdjuster.cpp
index 01b0857a3e2e95ba27a5e8c6f42dbe2f07299594..40acdfd1c83685df2a601b710af257491bcd1ea9 100644
--- a/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/Source/core/css/resolver/StyleAdjuster.cpp
@@ -270,42 +270,28 @@ void StyleAdjuster::adjustStyleForAlignment(RenderStyle& style, const RenderStyl
         if (parentStyle.justifyItemsPositionType() == LegacyPosition) {
             style.setJustifyItems(parentStyle.justifyItems());
             style.setJustifyItemsPositionType(parentStyle.justifyItemsPositionType());
-        } else if (isFlexOrGrid) {
-            style.setJustifyItems(ItemPositionStretch);
+        } else {
+            style.setJustifyItems(isFlexOrGrid ? ItemPositionStretch : ItemPositionStart);
         }
     }
 
     // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
     // and to the computed value of justify-items on the parent (minus
-    // any legacy keywords) on all other boxes.
-    if (style.justifySelf() == ItemPositionAuto) {
-        if (absolutePositioned) {
-            style.setJustifySelf(ItemPositionStretch);
-        } else {
-            style.setJustifySelf(parentStyle.justifyItems());
-            style.setJustifySelfOverflowAlignment(parentStyle.justifyItemsOverflowAlignment());
-        }
-    }
+    // any 'legacy' keywords) on all other boxes (to be resolved during the layout).
+    if ((style.justifySelf() == ItemPositionAuto) && absolutePositioned)
+        style.setJustifySelf(ItemPositionStretch);
 
     // The 'auto' keyword computes to:
     //  - 'stretch' for flex containers and grid containers,
     //  - 'start' for everything else.
-    if (style.alignItems() == ItemPositionAuto) {
-        if (isFlexOrGrid)
-            style.setAlignItems(ItemPositionStretch);
-    }
+    if (style.alignItems() == ItemPositionAuto)
+        style.setAlignItems(isFlexOrGrid ? ItemPositionStretch : ItemPositionStart);
 
     // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
     // and to the computed value of align-items on the parent (minus
-    // any 'legacy' keywords) on all other boxes.
-    if (style.alignSelf() == ItemPositionAuto) {
-        if (absolutePositioned) {
-            style.setAlignSelf(ItemPositionStretch);
-        } else {
-            style.setAlignSelf(parentStyle.alignItems());
-            style.setAlignSelfOverflowAlignment(parentStyle.alignItemsOverflowAlignment());
-        }
-    }
+    // any 'legacy' keywords) on all other boxes (to be resolved during the layout).
+    if ((style.alignSelf() == ItemPositionAuto) && absolutePositioned)
+        style.setAlignSelf(ItemPositionStretch);
 }
 
 void StyleAdjuster::adjustStyleForTagName(RenderStyle* style, RenderStyle* parentStyle, Element& element)