Mirko Bonadei edc347c4e5 Introduce (Un)SubscribeDtlsTransportState methods.
WebRTC is going to remove cricket::DtlsTransportState and switch to
webrtc::DtlsTransportState. This CL introduces a set of new methods to
allow to subscribe to DTLS transport state updates while WebRTC
internally migrates away from cricket::DtlsTransportState.

No-Try: True
Bug: webrtc:12762
Change-Id: I79cf48e2f7122cc76fde6e4fd1541382fd096d53
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/218607
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34075}
2021-05-21 10:56:44 +00:00
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