544b17c6a9f5dcedd99ce3ba7ada1417ab50957a

Also added a unittest. This is the first step towards creating an AutoMuter function in WebRTC. R=mflodman@webrtc.org, stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/2294005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4857 4adac7df-926f-26a2-2b94-8c16560cd09d
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