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This implements https://github.com/flutter/flutter/issues/132654#issuecomment-1738221257, namely: Make `Chromium.close` more robust: * Send `SIGTERM` and wait up to 5 seconds, if the process exited, great! Return from the function. * If the process has not exited, then send a `SIGKILL`, which is a much firmer way to exit a process. Same as before, wait up to 5 seconds, if the process exited, great! Return from the function. * If it still hasn't exited then give up trying to exit Chromium, just print a warning to the console and return from the function. Bonus: a few nullability fixes and extra `-v` logging. Fixes https://github.com/flutter/flutter/issues/132654
Web integration tests
These tests are not hermetic, and use the actual Flutter SDK. While
they don't require actual devices, they run flutter_tester to test
Dart web debug services (dwds) and Flutter integration.
Use this command to run (from the flutter_tools directory):
../../bin/cache/dart-sdk/bin/dart run test test/web.shard
These tests are expensive to run and do not give meaningful coverage information for the flutter tool (since they are black-box tests that run the tool as a subprocess, rather than being unit tests). For this reason, they are in a separate shard when running on continuous integration and are not run when calculating coverage.