[ScrollTimeline] Do not show scrollbar to bypass flakiness on early Mac #22496
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The flaky tests are not related to worklet animations because it's the
reference file that is not painted correctly.
Mac scrollbars have their own painting path and they paint greedily.
There might be a race condition on the order of painting that caused the
scrollbar being completely black.
Bug: 946534
Change-Id: I5e2fab05e7a5ee5ec09dcab2a03606ca5ce1fd0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124296
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754480}