[LayoutNG] Don't implement ContainerSize() using the physical constraint space.

third_party/WebKit/Source/core/layout/ng/ng_units.h

Index: third_party/WebKit/Source/core/layout/ng/ng_units.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_units.h b/third_party/WebKit/Source/core/layout/ng/ng_units.h
index c4be357477675a71fb3df86e2c90aa5bbcbbaf2f..67071df2ca5974cfd554940fb0cd659148f8d8a6 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_units.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_units.h
@@ -26,6 +26,13 @@ struct NGLogicalSize {
   LayoutUnit block_size;
 
   NGPhysicalSize ConvertToPhysical(NGWritingMode mode) const;
+  NGLogicalSize ConvertToWritingMode(NGWritingMode current_mode,
+                                     NGWritingMode new_mode) const {
+    if ((current_mode == HorizontalTopBottom) !=
+        (new_mode == HorizontalTopBottom))
+      return NGLogicalSize(block_size, inline_size);
+    return *this;
+  }
 };
 
 // NGLogicalOffset is the position of a rect (typically a fragment) relative to