[LayoutNG] Abort a layout once the BFC offset is resolved.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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_constraint_space.h"
 
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/ng/ng_constraint_space_builder.h"
 
@@ skipping 82 matching lines @@
     available_size.inline_size =
         box.BorderAndPaddingLogicalWidth() + box.OverrideLogicalContentWidth();
     fixed_inline = true;
   }
   if (box.HasOverrideLogicalContentHeight()) {
     available_size.block_size = box.BorderAndPaddingLogicalHeight() +
                                 box.OverrideLogicalContentHeight();
     fixed_block = true;
   }
 
-  bool is_new_fc =
-      box.IsLayoutBlock() && ToLayoutBlock(box).CreatesNewFormattingContext();
+  bool is_new_fc = true;
+  // TODO(ikilpatrick): This DCHECK needs to be enabled once we've switched
+  // LayoutTableCell, etc over to LayoutNG.
+  //
+  // We currently need to "force" LayoutNG roots to be formatting contexts so
+  // that floats have layout performed on them.
+  //
+  // DCHECK(is_new_fc,
+  //  box.IsLayoutBlock() && ToLayoutBlock(box).CreatesNewFormattingContext());
 
   FloatSize icb_float_size = box.View()->ViewportSizeForViewportUnits();
   NGPhysicalSize initial_containing_block_size{
       LayoutUnit(icb_float_size.Width()), LayoutUnit(icb_float_size.Height())};
 
   // ICB cannot be indefinite by the spec.
   DCHECK_GE(initial_containing_block_size.width, LayoutUnit());
   DCHECK_GE(initial_containing_block_size.height, LayoutUnit());
 
   return NGConstraintSpaceBuilder(writing_mode)
@@ skipping 68 matching lines @@
       bfc_offset_.block_offset.ToString().Ascii().data(),
       AvailableSize().inline_size.ToString().Ascii().data(),
       AvailableSize().block_size.ToString().Ascii().data(),
       margin_strut_.ToString().Ascii().data(),
       clearance_offset_.has_value()
           ? clearance_offset_.value().ToString().Ascii().data()
           : "none");
 }
 
 }  // namespace blink