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[flutter tools] Add a DelegatingLogger class Move most of `DelegateLogger` `from test/src/testbed.dart` to `lib/src/base/logger.dart` to better formalize the common practice of chaining `Logger`s together. I renamed the class since it isn't itself the delegate and to better match the `Delegating...` classes from `package:collection`. Additionally, add a freestanding `asLogger<T>` function to "cast" a `Logger` into a matching delegate if possible. This will allow `Logger` chains to be ordered a *bit* more freely (e.g. `NotifyingLogger` and `AppRunLogger` will no longer required to be at the end of the chain, an unwritten rule that has led to breakage in google3). Chain order still matters since lack of virtual dispatch means that parent `Logger`s can never invoke child methods, however. I made `asLogger<T>` a freestanding function because I didn't want to make it part of the `Logger` interface (and I thought that making it an extension method might be weird). Bonus cleanup: There no longer appears to be a way to construct an `AppRunLogger` with a null parent, so remove all of code paths for that case and make the `parent` construction parameter required. |
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| .. | ||
| analyze_size_test.dart | ||
| async_guard_test.dart | ||
| bot_detector_test.dart | ||
| build_test.dart | ||
| command_help_test.dart | ||
| common_test.dart | ||
| context_test.dart | ||
| error_handling_io_test.dart | ||
| file_system_test.dart | ||
| fingerprint_test.dart | ||
| io_test.dart | ||
| logger_test.dart | ||
| logs_test.dart | ||
| net_test.dart | ||
| os_test.dart | ||
| os_utils_test.dart | ||
| platform_test.dart | ||
| process_test.dart | ||
| signals_test.dart | ||
| terminal_test.dart | ||
| user_messages_test.dart | ||