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}