WebRTCDemo: ensures that using front and back camera work as expected.

I.e. egress: Real world up is stream up.
Ingress: stream up is app up.
Local (preview): Real world up is app up.

BUG=1763
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1642004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4227 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed