Record task-like timing in fire an event

[noamr]

Together with w3c/long-animation-frames#37

This allows clustering a "fire an event" timeframe in terms of frame timing monitoring, as opposed to relying on an "implicit document", which is a deprecated and non-interoperable term.

The implication of this is that if this event firing schedules a render that ends up as a long animation frame, the whole event firing duration would be counted towards this performance entry, regardless of "tasks".

See w3c/long-animation-frames#36

• At least two implementers are interested (and none opposed):
  • …
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• Tests are written and can be reviewed and commented upon at:
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• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno (only for aborting and events): …
  • Node.js (only for aborting and events): …
• MDN issue is filed: …
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(See WHATWG Working Mode: Changes for more details.)

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