- Add front/back camera switch test.
- Add video source stop and restart test to simulate
application going into background.
- Add a loopback test for 3 video codecs - VP8, VP8, H.264.
- Add a loopback test for voice only call.
R=wzh@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/43459004
Cr-Commit-Position: refs/heads/master@{#8560}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8560 4adac7df-926f-26a2-2b94-8c16560cd09d