Add promise version setTimeout with AbortSignal support

[saschanaz]

Closes #617

• At least two implementers are interested (and none opposed):
  • Gecko @annevk ?
• Tests are written and can be reviewed and commented upon at:
  • TODO
• Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …

(See WHATWG Working Mode: Changes for more details.)

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[domenic]

I think Chrome is more interested in supporting

const promise = scheduler.postTask(fn, { delay: 100, signal });

as part of the effort at https://github.com/WICG/main-thread-scheduling/blob/master/PrioritizedPostTask.md#posting-delayed-tasks . Maybe @shaseley can confirm?

[shaseley]

Yes, we are indeed proposing scheduler.postTask for this, which additionally enables (dynamic) prioritization. It's currently behind a flag and in origin trial in Chrome. We haven't drafted a spec yet, but are hoping to in the near future.