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worker: use fake MessageEvent for port.onmessage

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/worker-onmessage-messageevent into master

Instead of passing the payload for Workers directly to .onmessage, perform something more similar to what the browser API provides, namely create an event object with a .data property.

This does not make MessagePort implement the EventTarget API, nor does it implement the full MessageEvent API, but it would make such extensions non-breaking changes if we desire them at some point in the future.

(This would be a breaking change if Workers were not experimental. Currently, this method is also undocumented and only exists with the idea of enabling some degree of Web compatibility.)

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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