[CSS Grid Layout] Stretch value for align and justify properties.

Source/core/rendering/RenderFlexibleBox.cpp

Index: Source/core/rendering/RenderFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderFlexibleBox.cpp b/Source/core/rendering/RenderFlexibleBox.cpp
index 42fed8d2894fbed034511f2eb3439a26ee789173..51454b7179a4eb3ffcc6e7fb45df9a2b67d5c165 100644
--- a/Source/core/rendering/RenderFlexibleBox.cpp
+++ b/Source/core/rendering/RenderFlexibleBox.cpp
@@ -208,8 +208,8 @@ void RenderFlexibleBox::styleDidChange(StyleDifference diff, const RenderStyle*
         // Flex items that were previously stretching need to be relayed out so we can compute new available cross axis space.
         // This is only necessary for stretching since other alignment values don't change the size of the box.
         for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
-            ItemPosition previousAlignment = RenderStyle::resolveAlignment(oldStyle, child->style());
-            if (previousAlignment == ItemPositionStretch && previousAlignment != RenderStyle::resolveAlignment(style(), child->style()))
+            ItemPosition previousAlignment = RenderStyle::resolveAlignment(oldStyle, child->style(), ItemPositionStretch);
+            if (previousAlignment == ItemPositionStretch && previousAlignment != RenderStyle::resolveAlignment(style(), child->style(), ItemPositionStretch))
                 child->setChildNeedsLayout(MarkOnlyThis);
         }
     }
@@ -1003,7 +1003,7 @@ void RenderFlexibleBox::prepareChildForPositionedLayout(RenderBox& child, Layout
 
 ItemPosition RenderFlexibleBox::alignmentForChild(RenderBox& child) const
 {
-    ItemPosition align = RenderStyle::resolveAlignment(style(), child.style());
+    ItemPosition align = RenderStyle::resolveAlignment(style(), child.style(), ItemPositionStretch);
 
     if (align == ItemPositionBaseline && hasOrthogonalFlow(child))
         align = ItemPositionFlexStart;