Chris Bracken 7ff50beb59 Add FlutterProjectArgs::root_isolate_create_callback (flutter/engine#7651)
Allows embedders to specify a callback to be invoked in isolate scope
once root isolate has been created and marked runnable.

As an example of where this is useful, embedder unit test fixtures may
want to include Dart functions backed by a native implementation. On
isolate creation, this patch allows the unit test author to call
Dart_SetNativeResolver in root isolate scope.
2019-02-06 14:16:47 -08:00
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