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Following CL:1074989 that fixed inline-level baseline for
flipped-lines (vertical-lr), this patch fixes block-level
baselines.

When NGBlockLayoutAlgorithm propagates baselines from its
child line boxes, line boxes and font metrics are in the
[line-relative] coordinates. This needs to be converted to
[flow-relative] coordinates when adding to box fragments.

[flow-relative]: https://drafts.csswg.org/css-writing-modes-3/#logical-directions
[line-relative]: https://drafts.csswg.org/css-writing-modes-3/#line-directions

Bug: 636993
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: If4ddc2374cc0351120ae672614a32f38bb1f3bc8
Reviewed-on: https://chromium-review.googlesource.com/1087192Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567092}