Merge 238501 "Attempt to fix audio wedges by restarting all stre..."

Merge 238501 "Attempt to fix audio wedges by restarting all stre..."

> Attempt to fix audio wedges by restarting all streams on OSX.
> 
> Introduces two new methods to AudioOutputDispatcher:
> CloseStreamsForWedgeFix() and RestartStreamsForWedgeFix().
> 
> Respectively, each method closes or restarts all active
> streams owned by a given dispatcher.  The process is
> completely transparent to upstream clients.
> 
> A new method on AudioManager, FixWedgedAudio() calls
> CloseStreamsForWedgeFix() for all dispatchers and then
> calls RestartStreamsForWedgeFix() afterward.
> 
> FixWedgedAudio() is called by each AudioOutputController
> when a wedge is detected.  Multiple in flight wedge checks
> are serialized by the audio thread.  The hope is that wedges
> will be fixed before the next WedgeCheck() fires.
> 
> While the methods are available on all platforms, FixWedgedAudio()
> is only wired up on OSX.
> 
> BUG=160920
> TEST=unittest. fake wedge and observe stream recreation.
> R=scherkus@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=238325
> 
> Review URL: https://codereview.chromium.org/61203008

TBR=dalecurtis@google.com

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=240453

[DaleCurtis, 2013-12-12 22:46:26]

Committed patchset #1 manually as r240453.