Add another test case for AST/TOF switching. BUG= R=mflodman@webrtc.org Review URL: https://webrtc-codereview.appspot.com/5899005 git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5352 4adac7df-926f-26a2-2b94-8c16560cd09d