Voice engine shouldn't really have to manage this. Instead, have AGC keep track of the last input volume, so that it can avoid getting stuck under coarsely quantized conditions. Add a test to verify the behavior. TESTED=unittests, and observed that AGC didn't get stuck on a MacBook where this problem can actually occur. R=bjornv@webrtc.org Review URL: https://webrtc-codereview.appspot.com/8729004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5571 4adac7df-926f-26a2-2b94-8c16560cd09d