Auto instantiate RBE depending on whether AST or TOF is available in incoming packet stream.

BUG=
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5409004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5293 4adac7df-926f-26a2-2b94-8c16560cd09d
19 files changed