increase. VP9 and other codecs can in theory add spatial layers without a key frame. Bug: webrtc:12000 Change-Id: I27461af2e34c855203a130e400a6aa01144d3cf7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198781 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32883}