Alexander Aprelev e0cd42e4ad Roll engine to 76cb311d9c33720dcd19274228b39ecdbad8d9af (with rolled dart) (#16518)
* Handle error count reported by frontend.

Extend compilation result from single string to a structure(string filename and integer error count).

* Use ?.

* Include engine roll with dart sdk roll.

* parse(onError) -> tryParse

* Make '?? throw' more readable and avoid issue with analyzer

* Fix test so it mocks compiler output including errors count
2018-04-12 16:28:01 -07:00
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