Tomas Gunnarsson e984aa2e58 Add thread accessors to Call.
Classes associated with the Call instance, need access to these threads
and/or awareness, for checking for thread correctness.

Bug: webrtc:11993
Change-Id: I93bcee0657875f211be2ec959b96f818fa9fd8a0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215584
Reviewed-by: Markus Handell <handellm@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33772}
2021-04-19 15:59:20 +00:00
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