[A11y] Add a perf test for content-visibility: auto with scrolling

Bug: 40066846
Change-Id: I0c047d01f06595f335ba780e541c6095b0af5c5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5425917


Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1283196}