Convert PeerConnection integration tests to the track-based API
Convert PeerConnection integration tests to the track-based API

Bug: webrtc:8742
Change-Id: I4e120f4c7a635201028155486530bb4fbdae2a8b
Reviewed-on: https://webrtc-review.googlesource.com/39386
Reviewed-by: Peter Thatcher <86dc5d06abaeadbc7f61dd701fafcbca29ff9bbc@webrtc.org>
Commit-Queue: Steve Anton <93f73658da16553b94c040887a439a155812e54e@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#21666}
TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc