Do not report work outside of event loop

[npm1]

Fixes w3c/longtasks#77. Reporting work outside of the event loop could leak information such as long GC.

• At least two implementers are interested (and none opposed):
  • Chrome
  • Firefox
• Tests are written and can be reviewed and commented upon at:
  • This cannot be tested by WPTs. Only Chrome implements this API at the moment which does not leak this information as far as I can tell.

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/webappapis.html ( diff )

[annevk]

This should also have removed "event loop end", no?

[npm1]

I think a variable like that would be needed to split the work within the 'task' in 'spin the event loop'. But it's unused right now, and hopefully the task reentrancy is removed instead, so I can remove this.

[domenic]

Sorry about missing that in review; I did mentally note to check for dead code, but failed to find it.