Harald Alvestrand 44d0dff7a9 Move the PeerConnection's usage pattern concept to its own file.
This makes it easier to use it from multiple other modules.

Bug: webrtc:11995
Change-Id: Id23843ae4600ebe46aed7465e873d107089fd50b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/187347
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32361}
2020-10-09 08:29:45 +00:00
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