Fix web-sys public agents and improve multithread web-sys

[jstarry]

Problem

• Web workers were not working in the web-sys multithread example project
• No working example for web-sys web workers
• wasm-bindgen tries to build ..._bg.wasm url but references document and therefore fails

Changes

• Fix web-sys worker initialization by sending _bg.wasm url explicitly
• Update gloo to github revision so that IntervalService works on workers for web_sys feature
• Improve web-sys multithread example readme

[jstarry]

@daxpedda @TheNeikos could you two please look over the changes in src/agent.rs? I noticed that wasm-bindgen tries to build the _bg.wasm link using document and so it needs to be worked around for workers

[daxpedda]

I noticed that wasm-bindgen tries to build the _bg.wasm link using document and so it needs to be worked around for workers

I fixed it here: rustwasm/wasm-bindgen#2038.
But it is unrelated to us, because we are making a Blob, wasm-bindgen can't actually build the correct path anyway.
So the workaround is fine in my opinion.

[jstarry]

I fixed it here: rustwasm/wasm-bindgen#2038.

Nice!

But it is unrelated to us, because we are making a Blob, wasm-bindgen can't actually build the correct path anyway.

Yes, exactly. I like the blob approach you added because it removes the need to have a simple js file which does that initialization

So the workaround is fine in my opinion.

Sweet, thanks for taking a look!

[daxpedda]

By the way, I was trying to figure out why we had a onmessage here, I couldn't figure it out, but in any case this code doesn't do anything.
If it does, but not in the example, it would error because wasm_bindgen.child_entry_point doesn't exist.

[jstarry]

Thanks!

#1013