9e829cbd92
Current implementation runs timers and microtask callbacks in the root zone. That assumes that the top-level `scheduleMicrotask` or `Timer` constructors have been used, which have so far wrapped the callback with `runCallbackGuarded` before calling the zone implementation. That means that doing `zone.scheduleMicrotask` directly would not ensure that the microtask was run in the correct zone. If a `run` handler throws, it wouldn't be caught. This change makes the `realAsyncZone` do whatever the root zone would do if its `ZoneDelegate` got called with the intended zone and arguments. That should be consistent with the current behavior, and be compatible with incoming bug-fixes to the platform `Zone` behavior. Prepares Flutter for landing https://dart-review.googlesource.com/c/sdk/+/406961 which is currently blocked (so this indirectly fixes https://github.com/dart-lang/sdk/issues/59913). There are no new tests, the goal is that all existing tests keep running, and that they keep doing so when the Dart CL lands. Currently that CL only breaks one test, the `dev/automated_tests/test_smoke_test/fail_test_on_exception_after_test.dart` test which threw the error-after-test in the root zone instead of the test zone. This change fixes that.
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