The following layout test is a flaky timeout on macOS fast/workers/worker-terminate.html Probable cause: Regression point is unknown, this test appears to have been flaky for a while. Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fworkers%2Fworker-terminate.html
The test usually runs in about a second.
Marked test as flaky in https://trac.webkit.org/r226476