Do basic parsing of RTCP headers in PcapFileReader to enable log filtering.

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

Review URL: https://webrtc-codereview.appspot.com/1697004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4266 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed