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- Only create a context if the directory/.packages/pubspec.yaml is not excluded. - Add tests. Fixes: https://github.com/dart-lang/sdk/issues/23941 R=brianwilkerson@google.com, devoncarew@google.com, paulberry@google.com, pquitslund@google.com Review URL: https://codereview.chromium.org//1263443005 .