Started on:
https://build.chromium.org/p/chromium.memory.fyi/builders/Windows%20Unit%20%28DrMemory%29/builds/4976

r397288 is culprit. I'll exclude the test on DrMemory for now.

AudioOutputControllerTest.PlayDuplicateStopClose:
c:\b\build\slave\drm-cr\build\src\media\audio\audio_output_controller_unittest.cc(208): error: Mock function called more times than expected - returning directly.
Function call: OnDataCheck(1)
Expected: to be called once
Actual: called twice - over-saturated and active
c:\b\build\slave\drm-cr\build\src\media\audio\audio_output_controller_unittest.cc(208): error: Mock function called more times than expected - returning directly.
Function call: OnDataCheck(1)
Expected: to be called once
Actual: called 3 times - over-saturated and active
c:\b\build\slave\drm-cr\build\src\media\audio\audio_output_controller_unittest.cc(208): error: Mock function called more times than expected - returning directly.
Function call: OnDataCheck(1)
Expected: to be called once
Actual: called 4 times - over-saturated and active