Nested view transitions: support view-transition-group: contain
Instead of just saving the nearest group for every vt-name,
save also the nearest group that has "contain".
Use that group as the default instead of null when exits.
Bug: 347947051
Change-Id: I47b54f612d8b3ccbbe631fc8f0a037fc51ad9ec1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5749070
Reviewed-by: Khushal Sagar khushalsagar@chromium.org
Commit-Queue: Noam Rosenthal nrosenthal@chromium.org
Cr-Commit-Position: refs/heads/main@{#1338321}