Tze Kwang Chin 307a0922c5 Support delayed AudioUnit initialization.
Applications can choose to decide when to give up control of the
AVAudioSession to WebRTC. Otherwise, behavior should be
unchanged.

Adds a toggle to AppRTCDemo so developers can see the different
paths.

BUG=
R=haysc@webrtc.org

Review URL: https://codereview.webrtc.org/1822543002 .

Cr-Commit-Position: refs/heads/master@{#12080}
2016-03-21 20:58:01 +00:00
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