zstein d48dbda434 Add a minimal RtpTransport class for use by BaseChannel.
This will eventually implement webrtc::RtpTransportInterface from api/ortc.
It needs to live in the pc build target until the pc <- ortc dependency is inverted.

BUG=webrtc:7013

Review-Url: https://codereview.webrtc.org/2792223002
Cr-Commit-Position: refs/heads/master@{#17534}
2017-04-05 02:45:57 +00:00
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