Flakes originally reported in  bug 900360 .

Hi vabr@, thank you for reporting this to us. Actually there is an open bug (900148) on milo, which makes the build page show spurious step results. So the test is actually flaky but the information is not on milo right now.

If you look at any occurrence's step logs from https://cr-buildbucket.appspot.com/rpcexplorer/services/buildbucket.v2.Builds/GetBuild?request={%20%20%20%20%22id%22:%20%228931228707859609232%22,%20%20%20%20%22fields%22:%20%22id,status,builder,steps%22} (this is for https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win10_chromium_x64_rel_ng/127008), you can find that 'interactive_ui_tests (with patch) on Windows-10-15063' step actually failed.

And I found the task https://chromium-swarm.appspot.com/task?id=40de7b7b21f33910&refresh=10&show_raw=1 which contains the flaky test.

Thanks for the link to the logs!