WebCodecs support for AV1 screen content coding tools

[fippo]

Request for Mozilla Position on an Emerging Web Specification

• Specification title: WebCodecs (a tiny codec specific subfeature)
• Specification or proposal URL (if available): https://w3c.github.io/webcodecs/av1_codec_registration.html
• Explainer URL (if available): https://github.com/fippo/webrtc-explainers/blob/gh-pages/av1-screencontent/index.md
• Proposal author(s) (@-mention GitHub accounts): @fippo, @aboba
• Caniuse.com URL (optional): n/a
• Bugzilla URL (optional): n/a
• Mozillians who can provide input (optional): @padenot

Other information

I assume the answer is going to be the same as here but was asked to file.

[fippo]

The functionality ended up in contentHint (#919) instead