We should probably handle a shutdown hook that throws an exception similarly to how we handle exceptions from signal handlers. See shutdown hook processing here:

https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/base/process.dart#L118

and signal handler processing here:

https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/base/signals.dart#L134