[LayoutNG] Use containing block size correctly for abspos. #9589
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UpdateOutOfFlowBlockLayout() needs to deal with both the actual
containing block size, as specified by CSS (i.e. the padding box size),
and the border-box size of the object that is the containing block of an
absolutely positioned descendant.
Some light cleanup. We always need the border sizes, so just calculate
them once, unconditionally. Also, there seems no need for a special path
for grid/flex, so I removed it.
Some tests start to pass. All but one are still expected to fail in legacy.
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I85462d76aa9fa3d0105bf079e59f7c2a7a70f117
Reviewed-on: https://chromium-review.googlesource.com/926004
Reviewed-by: Aleks Totic atotic@chromium.org
Commit-Queue: Morten Stenshorne mstensho@chromium.org
Cr-Commit-Position: refs/heads/master@{#537918}