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The spec: https://drafts.csswg.org/web-animations/#combining-shadow-lists
The bug stems from: https://bugs.chromium.org/p/chromium/issues/detail?id=1005828

Bug: 10020843
Change-Id: I48fb990d76ba0b3e6e0bfc74bd46e2391a092259
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960887
Commit-Queue: Hao Sheng <haozhes@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728535}