This way VP8Decoder and DecoderFallback would use propagated instead of global field trials. Bug: webrtc:15791, webrtc:10335 Change-Id: I5ad5fae38f5b9379bc6376334562c154fbc56e39 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/340040 Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Auto-Submit: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41763}