Legacy out-of-flow descendant propagation

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

Index: third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
index 6752c496e63bc1512181bca8990545e7ed0e13de..6410d6ab882310807be524338ac5e5d86b8123ca 100644
--- a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
+++ b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
@@ -4,6 +4,7 @@
 
 #include "core/layout/ng/layout_ng_block_flow.h"
 #include "core/layout/ng/ng_constraint_space.h"
+#include "core/layout/ng/ng_fragment_base.h"
 #include "core/layout/LayoutAnalyzer.h"
 
 namespace blink {
@@ -28,6 +29,9 @@ void LayoutNGBlockFlow::layoutBlock(bool relayoutChildren) {
   NGFragmentBase* fragment;
   while (!m_box->Layout(constraint_space, &fragment))
     ;
+
+  for (auto& descendant : fragment->PhysicalFragment()->OutOfFlowDescendants())
+    descendant->UseOldOutOfFlowPositioning();
   clearNeedsLayout();
 }