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Add --preview-dart-2 relaunch test. (#15117)

* Add a test that measures/verifies start from warm state(app was previously compiled).

* Remove json file from the first run.
A
Alexander Aprelev committed
758b302c8ddf97382e99bc0ff3b6e39fcbe8ad98
Parent: 85412d8
Committed by GitHub <noreply@github.com> on 3/6/2018, 10:33:26 PM