view-transition: Test concurrent transitions in sibling frames.
Bug: 330917526
Change-Id: I383767131b6d5df6345d901fa433f68f3497a847
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5530586
Reviewed-by: Vladimir Levin vmpstr@chromium.org
Commit-Queue: Khushal Sagar khushalsagar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1300897}