brandtr 9dfff29bc4 Make FlexFEC packets paceable through RTPSender.
Prior to this change, FlexFEC packets that were paced would be lost in
the RTPSender, since they were not stored in a packet history. This CL
introduces such a packet history, as well as the needed wireup for
higher layers to be aware that the particular RTPSender is able to
send FlexFEC packets with a particular SSRC.

Updated RTPSender unit test to reflect the fact that paced packets
are now actually sent.

BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2491293002
Cr-Commit-Position: refs/heads/master@{#15066}
2016-11-14 13:14:54 +00:00
..
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