c0a95863bd
As a side effect, break out pc/simulcast_description.
Step 1: Don't move the {h,cc} files; just declare the targets
so that downstream projects can add dependencies on it.
Bug: webtc:11967
Change-Id: Iad3d77513af418b664c1bef46070177ed24027fc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/221603
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34254}