Alexander Aprelev 834a85578d Fix shell launcher test (dart2 compliant and stop polling) (flutter/engine#5009)
* Make test Dart2 compliant

* Use service and debug events instead of polling to wait for isolate to start, run and resume.

* Refactor into _onServiceEvent. Wait for 'paused' event instead of 'isolate runnable'.
2018-04-16 19:31:43 -07:00
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