commit 1f6aa9fd67975f9c6f27a58cf091ec1fc3ceaff2
author Bjorn Mellem <mellem@webrtc.org> Tue Oct 30 22:15:00 2018
committer Commit Bot <commit-bot@chromium.org> Wed Oct 31 18:44:31 2018
tree 09b40c6a6da14181027f4f14981f17a9ef7af53d
parent 062a691cae734620db248def003192edac1f23e3

Add interfaces for using MediaTransport as the transport for data channels.

Adds the types and methods required for sending and receiving data
channel messages over the media transport.  These are:
 - A DataMessageType to distinguish between text, binary, and control
 messages
 - A parameters struct for sending data messages, which specifies the
 channel id, type, and ordering/reliability parameters
 - A sink for data-channel related callbacks (receive data, begin
 closing procedure, and end closing procedure)
 - A method to set the sink for data channels
 - Methods to open, close, and send on data channels

These methods, combined with the state sink, allow PeerConnection to
implement the DataChannelProviderInterface using MediaTransport as the
underlying transport.

Change-Id: Iccb2ba374594762a5b4f995564e2a1ff7d8805f5
Bug: webrtc:9719
Reviewed-on: https://webrtc-review.googlesource.com/c/108541
Reviewed-by: Anton Sukhanov <sukhanov@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Peter Slatala <psla@webrtc.org>
Commit-Queue: Bjorn Mellem <mellem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25454}