[@container] Add parsing tests for scroll-state(overflowing)
Bug: 367764865
Change-Id: I6bb49467bd273aa25fd9332a9e5e5d868bd86bc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5872842
Commit-Queue: Rune Lillesveen futhark@chromium.org
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Cr-Commit-Position: refs/heads/main@{#1357517}