Add WebIDLs for experimental AudioContext sinkId, setSinkId

[tylerbarker]

Hey, I'm working on some audio stuff and found these features I need were missing - thought it might be useful to contribute? Let me know if I'm missing something or have done this incorrectly. Cheers ✌️

[tylerbarker]

Okay what I can gather from the failing CI is there's an issue because I mistakenly hard-coded the experimental feature decorators in gen_AudioContext.rs.

I can see now they need to be included in the unstable/ directory instead, how would I go about that given AudioContext is already stable? Is there a way I can write a partial IDL in unstable/ which I can include in the main IDL?

[daxpedda]

Yes, you should be able to use partial interface, it's used quite often in wasm-bindgen already.

Let me know if you encounter any problems.

[daxpedda]

We should implement the rest of the interface too:

• AudioSinkInfo
• AudioSinkOptions
• AudioSinkType
• BaseAudioContext.onsinkchange
• AudioContextOptions.sinkId

[daxpedda]

To generate the WebIDL correctly you have to run the following:

cd crates/web-sys
cargo run --release --package wasm-bindgen-webidl -- webidls src/features ./Cargo.toml

[daxpedda]

LGTM!
Missing an entry in the changelog.

[daxpedda]

Thanks @tylerbarker!

I just rebased and fixed the changelog.