moznion 46da8536b6 Add some options to format subcommand (#18360)
* Add `--dry-run` option to `flutter format` sub command

* Add `--set-exit-if-changed` option to `format` sub command

* Add `--machine` option to `format` sub command

* Make variable names to be not shorthand: cmd -> command

Fix https://github.com/flutter/flutter/pull/18360#discussion_r199656120
2018-07-24 16:37:00 -07:00
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