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

third_party/WebKit/Source/core/layout/ng/ng_box.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/ng_box.h"
 
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/ng/layout_ng_block_flow.h"
 #include "core/layout/ng/ng_block_layout_algorithm.h"
 #include "core/layout/ng/ng_constraint_space.h"
@@ skipping 64 matching lines @@
     DCHECK(layout_box_);
     // TODO(layout-ng): If fixedSize is true, set the override width/height too
     NGLogicalSize container_size = constraint_space->ContainerSize();
     layout_box_->setOverrideContainingBlockContentLogicalWidth(
         container_size.inline_size);
     layout_box_->setOverrideContainingBlockContentLogicalHeight(
         container_size.block_size);
     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
     // overflow)
     NGFragmentBuilder builder(NGPhysicalFragmentBase::FragmentBox);
     builder.SetInlineSize(layout_box_->logicalWidth())
         .SetBlockSize(layout_box_->logicalHeight())
         .SetDirection(
             FromPlatformDirection(layout_box_->styleRef().direction()))
         .SetWritingMode(
@@ skipping 53 matching lines @@
 
 bool NGBox::CanUseNewLayout() {
   if (!layout_box_)
     return true;
   if (!layout_box_->isLayoutBlockFlow())
     return false;
   const LayoutBlockFlow* block_flow = toLayoutBlockFlow(layout_box_);
   return !block_flow->childrenInline() || !block_flow->firstChild();
 }
 }  // namespace blink