Context:

(1) Initially, Jenny has change for not popping up volume slider during device boot: https://chromium.googlesource.com/chromium/src/+/f615009fa3d171ebc5700b8928e349f83f861841

(2) Later, this change is modified to use
enum AutomatedVolumeChangeReason {
  VOLUME_CHANGE_INITIALIZING_AUDIO_STATE,
  VOLUME_CHANGE_MAXIMIZE_MODE_SCREENSHOT,
}
and deque by me in this CL: https://chromium.googlesource.com/chromium/src/+/fd7c37b98e7c6eca718257916ab65409ee7b2c1a

(3) For improved power button screenshot, we no longer need VOLUME_CHANGE_MAXIMIZE_MODE_SCREENSHOT, so removed in https://chromium.googlesource.com/chromium/src/+/3101a17d52c9efcf6de5a06ab576eb3f5e36711f

(4) thus, it doesn't make sense to keep an enum with just one VOLUME_CHANGE_INITIALIZING_AUDIO_STATE. I tried to restore to the changes in (1), but it has problem in issue 777463.

There must be something changed either in CRAS or CrasAudioHandler. Jenny, are you aware of what might happen here?

The repro steps in issue 777463 is listed in #21

Since the tests in issue 777463 is related to headphone, I suspected it may be related to  issue 746876 .