Also makes a small change to the tests to remove flakiness. We can't do BWE only based on rtp timestamps if we preemptively resend packets instead of sending padding packets. BUG=1812,2992 R=mflodman@webrtc.org, pbos@webrtc.org Review URL: https://webrtc-codereview.appspot.com/15719004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6400 4adac7df-926f-26a2-2b94-8c16560cd09d