This is necessary to migrate some clients so that we can move forward
with removal of cricket::WebRtcVideoDecoderFactory.
TBR=stefan@webrtc.org
Bug: webrtc:7925
Change-Id: Icc2949e3f7f3137d1b68eb30874f14a33168e41f
Reviewed-on: https://webrtc-review.googlesource.com/97500
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24671}
