Suppress virtual/threaded/external/wpt/animation-worklet/playback-rate.https.html

Causes breaks in on MacOS 10.13 webkit_layout_tests
https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests/10893

Suspect: 75c4bea0bb19ab2dca02456fd89c97fba31bce6d

BUG=940050
TBR=robertma@chromium.org

Change-Id: I2a558a0af74940a3bb57b10784bc73dc84107d85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1513082
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639291}
1 file changed