vie_autotest_loopback.cc will not be part of the commit, it's only to show the test. TEST=temporary with attached loopback test. Review URL: https://webrtc-codereview.appspot.com/390007 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1678 4adac7df-926f-26a2-2b94-8c16560cd09d