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This should avoid some double-layouts, and as a side-effect (the original
motivation) it also makes sure that we mark any descendants we find for
UseOldOutOfFlowPositioning(), which fixes a number of DCHECK(!NeedsLayout) failures.
That works through the result->OutOfFlowPositionedDescendants() loop in
LayoutNGBlockFlow::UpdateOutOfFlowBlockLayout.

Bug: 849839
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: If885b16cedaa01b65f7fe2548e42a48c5d3a8a0d
Reviewed-on: https://chromium-review.googlesource.com/1089652Reviewed-by: Aleks Totic <atotic@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565103}