Failure seen here:
https://ci.chromium.org/buildbot/tryserver.chromium.win/win_optional_gpu_tests_rel/17471

I just restarted the chromium.gpu.fyi waterfall so can't link to other builds, but I think it's failing consistently on other machines too.

[ RUN      ] AudioOutputTest.Play200HzTone
[1936:1488:1120/213733.972:36924219:WARNING:audio_low_latency_output_win.cc(196)] Using WASAPI output with a non-optimal buffer size, glitches from back to back shared memory reads and partial fills of WASAPI output buffers may occur.  Buffer size of 4410 is not an even divisor of 441
../../media/audio/audio_output_unittest.cc(100): error: Expected: (source.callbacks()) >= (1), actual: 0 vs 1
[  FAILED  ] AudioOutputTest.Play200HzTone (396 ms)