See https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&showAllRuns=true&tests=fast%2Fdom%2FWindow%2Fredirect-with-timer.html.

Example build: https://build.chromium.org/p/chromium.mac/builders/Mac10.12%20Tests/builds/5395

Log:
03:38:54.961 17905 worker/0 starting
03:38:55.249 17905 "system_profiler SPDisplaysDataType" took 0.29s
03:39:01.417 17905 killed pid 19837
03:39:01.418 17905 worker/0 fast/dom/Window/redirect-with-timer.html output stderr lines:
03:39:01.418 17905   
03:39:01.418 17905   DevTools listening on ws://127.0.0.1:64777/devtools/browser/07b40ffe-2f59-49b6-a831-65579ca0a0c4
03:39:01.419 17905 [1/1] fast/dom/Window/redirect-with-timer.html failed unexpectedly (test timed out)
03:39:01.419 17905 worker/0 killing primary driver
03:39:01.419 17905 worker/0 killing secondary driver
03:39:01.420 17905 worker/0 fast/dom/Window/redirect-with-timer.html failed:
03:39:01.420 17905 worker/0  test timed out
03:39:01.420 17905 worker/0 killing secondary driver
03:39:01.420 17905 worker/0 exiting
03:39:01.420 17905 worker/0 cleaning up
03:39:01.420 17905 worker/0 killing primary driver
03:39:01.420 17905 worker/0 killing secondary driver

Not sure who to assign this to, adding a couple of components, please add the correct components if these are wrong.