Also added an enum for unknown reason. New value uses a macro-like name rather than a constant-like name for consistency. Bug: chromium:1369096, webrtc:14131 Change-Id: Ib315584ec40d8c1cd9a6f0ff44587c0d92c735d5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/292341 Reviewed-by: Jonas Oreland <jonaso@webrtc.org> Commit-Queue: Sameer Vijaykar <samvi@google.com> Cr-Commit-Position: refs/heads/main@{#39262}