Legacy out-of-flow descendant propagation

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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 {
 
 LayoutNGBlockFlow::LayoutNGBlockFlow(Element* element)
     : LayoutBlockFlow(element) {}
 
 bool LayoutNGBlockFlow::isOfType(LayoutObjectType type) const {
   return type == LayoutObjectNGBlockFlow || LayoutBlockFlow::isOfType(type);
 }
 
 void LayoutNGBlockFlow::layoutBlock(bool relayoutChildren) {
   LayoutAnalyzer::BlockScope analyzer(*this);
 
   auto* constraint_space = NGConstraintSpace::CreateFromLayoutObject(*this);
 
   // TODO(layout-dev): This should be created in the constructor once instead.
   // There is some internal state which needs to be cleared between layout
   // passes (probably FirstChild(), etc).
   m_box = new NGBlockNode(this);
 
   NGFragmentBase* fragment;
   while (!m_box->Layout(constraint_space, &fragment))
     ;
+
+  for (auto& descendant : fragment->PhysicalFragment()->OutOfFlowDescendants())
+    descendant->UseOldOutOfFlowPositioning();
   clearNeedsLayout();
 }
 
 }  // namespace blink