Make CSS view-transition-class a tree-scoped name
Parse view-transition-class a s CSSScopedNameList, and match with the
document tree-scoped when capturing the old+new element.
CSSWG resolution: w3c/csswg-drafts#10529 (comment)
Bug: 358159341
Change-Id: Ib40816b8358bb9390a427bc4ea456d86f6060eab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5776943
Reviewed-by: Khushal Sagar khushalsagar@chromium.org
Commit-Queue: Noam Rosenthal nrosenthal@chromium.org
Cr-Commit-Position: refs/heads/main@{#1340430}