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If we ran simplified layout, or triggered layout from a subtree-root
the baseline of the fragment may have changed. While most of the time
this doesn't have any visible side-effect, there may be an arbitrary
ancestor which relies on this baseline, causing elements to be baseline
aligned incorrectly.

This patch does two things:
1) When simplified layout is triggered from simplified layout, check if
   the Baseline shifted, and return nullptr.
2) When we are being laid out as a subtree root (as an inflow element),
   check if the Baseline shifted, and mark our containing block chain
   for layout.

Bug: 1137905
Change-Id: I8c8fa2c981e9001cf6ec7f685d4451e1fe13c848
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509644Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823197}