Refactor the relationship between BaseChannel and MediaChannel so that we send over all the parameters in one method call rather then having them broken up into multiple method calls.  This should allow future refactorings of the WebRtcVideoEngine2 to not recreate configurations so many times, and have more simple code as well.

R=deadbeef@webrtc.org, pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1229283003 .

Cr-Commit-Position: refs/heads/master@{#9690}
7 files changed