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Locally if I run "pactl exit" and log the start time, up to 3 seconds
may elapse before the pa_context reaches the PA_CONTEXT_READY state. On
my local machine, something is restarting the pulse daemon
automatically within a few seconds. It's possible the bots are running
in some state where the pulsedaemon will not respawn, so we end up
hanging forever.

There's no easy way to timeout the wait for PA_CONTEXT_READY since on
the call into pa_threaded_mainloop_wait() just hangs and there's no way
to pump the mainloop otherwise it looks like. If we want to make the
loop timeout, we need to switch away from wait() to a spin/sleep loop.

Lets see if this fixes the issue first, if not then we can try a timeout
based approach.

R=guidou

Bug: 1047655
Change-Id: If81ef546c04aa33df8e35368102fd890016db76f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036901
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738151}