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This CL is a reland of
https://chromium-review.googlesource.com/c/chromium/src/+/788410

This CL makes the Chromium HW video factories implement the new
interfaces directly. It also adds SW codecs, simulcast, and SW fallback
codecs manually, instead of relying on WebRTC to do this. This will
give Chromium more flexibility in the future, and will allow us to
simplify the WebRTC code, since it's only Chromium that uses some of
these features.

Bug: webrtc:7925
Change-Id: Ib66ec75827363dc9e0985c35a6de936ca8f3a523
Reviewed-on: https://chromium-review.googlesource.com/1100463Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Anders Carlsson <andersc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580144}