Zhi Huang c08de0f4b7 Allow the TransportController to create RTP level transports.
Add methods to TransportController so that it can create RTP level transports
(RtpTransport, SrtpTransport and DtlsSrtpTransport.).

The RTP level transports are ref-counted since they could be shared by multiple
BaseChannels and TransportController manages the life time of the transports.

Bug: webrtc:7013
Change-Id: Ifd31062426e513d95473e257c9c9ff84a8c537fd
Reviewed-on: https://webrtc-review.googlesource.com/5080
Commit-Queue: Zhi Huang <zhihuang@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21196}
2017-12-11 09:19:25 +00:00
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