Harald Alvestrand cdcfab0a52 Refactor webrtc::PeerConnection to split out offer/answer
This reduces the size of peer_connection.cc by more than 2000 lines.

Design doc for refatoring (available on request):
https://docs.google.com/document/d/1ETeUhon9sJihEUpA9ZZHpOGhzDqlZGLQOk3cD_CjKDM/edit

Bug: webrtc:11995
Change-Id: I9ed8603807b45bb192a01df026755cb6b5365291
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185801
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32212}
2020-09-28 14:27:51 +00:00
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