[LayoutNG] Fix incorrectly positioned empty blocks inside of new BFC

third_party/WebKit/Source/core/layout/ng/ng_block_node.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_block_node.h"
 
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/api/LineLayoutAPIShim.h"
 #include "core/layout/line/InlineIterator.h"
 #include "core/layout/ng/layout_ng_block_flow.h"
@@ skipping 228 matching lines @@
   layout_box_->setHeight(fragment_->Height());
   NGBoxStrut border_and_padding =
       ComputeBorders(Style()) + ComputePadding(constraint_space, Style());
   LayoutUnit intrinsic_logical_height =
       layout_box_->style()->isHorizontalWritingMode()
           ? fragment_->HeightOverflow()
           : fragment_->WidthOverflow();
   intrinsic_logical_height -= border_and_padding.BlockSum();
   layout_box_->setIntrinsicContentLogicalHeight(intrinsic_logical_height);
 
+  // We may still have unpositioned floats when we reach the root box.
+  if (!layout_box_->parent()) {
+    for (const auto& floating_object : fragment_->PositionedFloats()) {
+      FloatingObjectPositionedUpdated(floating_object, layout_box_);
+    }
+  }
+
   // TODO(layout-dev): Currently we are not actually performing layout on
   // inline children. For now just clear the needsLayout bit so that we can
   // run unittests.
   if (HasInlineChildren()) {
     for (InlineWalker walker(
              LineLayoutBlockFlow(toLayoutBlockFlow(layout_box_)));
          !walker.atEnd(); walker.advance()) {
       LayoutObject* o = LineLayoutAPIShim::layoutObjectFrom(walker.current());
       o->clearNeedsLayout();
     }
@@ skipping 66 matching lines @@
 // Save static position for legacy AbsPos layout.
 void NGBlockNode::SaveStaticOffsetForLegacy(const NGLogicalOffset& offset) {
   DCHECK(layout_box_);
   DCHECK(layout_box_->isOutOfFlowPositioned());
   DCHECK(layout_box_->layer());
   layout_box_->layer()->setStaticBlockPosition(offset.block_offset);
   layout_box_->layer()->setStaticInlinePosition(offset.inline_offset);
 }
 
 }  // namespace blink