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I plan replacing all references to package:package_config with this new abstraction in future CLs. R=brianwilkerson@google.com, paulberry@google.com Change-Id: Ifbe2c6a16f12cbf32f895505b16857a790610f93 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128102 Reviewed-by: Paul Berry <paulberry@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>