Wired up max packet size and added simple test.

BUG=2428
R=mflodman@webrtc.org, pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2384004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4973 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed