Artem Titov 7c5541557b Fix call setup: change way of adding media to the call.
To correctly send media from Bob to Alice, when Alice is calling Bob
we have to add transceivers for Bob's media to Alice first, because
it is forbidden to add new media sections into answer in Unified Plan,
so Alice's offer have to contain media sections for Bob's media tracks.

Bug: webrtc:10138
Change-Id: I8a5f19aa5ed6051a981472d5c79493362365f587
Reviewed-on: https://webrtc-review.googlesource.com/c/124492
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Peter Slatala <psla@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26892}
2019-02-28 10:57:32 +00:00
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