[css-grid] "normal" alignment is "start" for replaced elements

third_party/WebKit/Source/core/layout/LayoutGrid.h

Index: third_party/WebKit/Source/core/layout/LayoutGrid.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutGrid.h b/third_party/WebKit/Source/core/layout/LayoutGrid.h
index ed2b80926039a6c6ba765fe64a7d8a47251c575e..84d80b814f27536fced40af0d2dd8768944ecc89 100644
--- a/third_party/WebKit/Source/core/layout/LayoutGrid.h
+++ b/third_party/WebKit/Source/core/layout/LayoutGrid.h
@@ -96,6 +96,13 @@ class LayoutGrid final : public LayoutBlock {
   bool cachedHasDefiniteLogicalHeight() const;
   bool isOrthogonalChild(const LayoutBox&) const;
 
+ protected:
+  ItemPosition selfAlignmentNormalBehavior(
+      const LayoutBox* child = nullptr) const override {
+    DCHECK(child);
+    return child->isLayoutReplaced() ? ItemPositionStart : ItemPositionStretch;
+  }
+
  private:
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectLayoutGrid || LayoutBlock::isOfType(type);