[layoutng] Make sure to force child layout for the legacy/ng interop

third_party/WebKit/Source/core/layout/ng/ng_box.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_box.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_box.cc b/third_party/WebKit/Source/core/layout/ng/ng_box.cc
index f6709a8fa357a7b409a17d55ad6f0917042ad86d..3c9667beefb82b6b1d7eaa7eda8b6b979216f057 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_box.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_box.cc
@@ -82,7 +82,7 @@ bool NGBox::Layout(const NGConstraintSpace* constraint_space,
     if (layout_box_->isLayoutNGBlockFlow() && layout_box_->needsLayout()) {
       toLayoutNGBlockFlow(layout_box_)->LayoutBlockFlow::layoutBlock(true);
     } else {
-      layout_box_->layoutIfNeeded();
+      layout_box_->forceLayout();
     }
     LayoutRect overflow = layout_box_->layoutOverflowRect();
     // TODO(layout-ng): This does not handle writing modes correctly (for