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The pulseaudio source code checks pa_context and pa_stream state
while waiting for operation completion. Lets do the same thing on
the off chance that's the source of our hangs.

See CHECK_DEAD_GOTO macro upstream:
https://github.com/pulseaudio/pulseaudio/blob/master/src/pulse/simple.c#L68

This change modifies the WaitForOperationCompletion() method to
take an optional pa_stream and/or pa_context and checks their
state while waiting. In cases where failure could be signaled as
an error upstream, a bool status code is used to do so.

BUG=986021
R=tguilbert

Change-Id: I7075293d1f74ad12f6c596bce39bbf0bba2c9a73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811698
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697806}