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This is a follow-up to
https://chromium-review.googlesource.com/c/chromium/src/+/1764942
which restricted vertical alignment of labels to multiline only.

It relaxes the restriction, allowing all render text to be top or bottom
aligned, though at the expense of the ability to guarantee baseline
alignment when mixed fonts are required to render a line (still a
feature of the default ALIGN_MIDDLE; a note has been put on the new
Label::SetVerticalAlignment() method to this effect).

Bug: 996905
Change-Id: I46d60902e91ea202f48ae2952b4c0cb118d80650
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772449Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690877}