[anchor] Support anchor(inside/outside)
The inside/outside keywords are simply mapped to their appropriate
physical sides during evaluation, similar to how logical sides are
handled.
This should have been part of the initial shipment of anchor
positioning, but was overlooked.
Fixed: 339041275
Change-Id: Ia316b083eeeb5e7b8dd889ab50ddc7ffc7749621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5537965
Reviewed-by: Rune Lillesveen futhark@chromium.org
Auto-Submit: Anders Hartvoll Ruud andruud@chromium.org
Reviewed-by: Mason Freed masonf@chromium.org
Commit-Queue: Anders Hartvoll Ruud andruud@chromium.org
Cr-Commit-Position: refs/heads/main@{#1302023}