Add frontendInternal key and external example to messages tests

This CL adds two keys to the messages.yaml file:

 * `frontendInternal` which indicates that we do not require a
    dart2jsCode nor a analyzerCode: there is no corresponding
    error in other tools

 * `external` which can be used instead of an example. The external
   file is not actually run to verify the example, but the file is
   checked for existance. This can for instance be used to test an
   internal frontend error code.

Change-Id: I2426c6ba2a2abe5baaab09c8e0947b4b876df083
Reviewed-on: https://dart-review.googlesource.com/54387
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Peter von der Ahé <ahe@google.com>
2 files changed
tree: eaa60f3e974871c69c7fd559c7581545624b09db
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitignore
  17. .gn
  18. .mailmap
  19. .packages
  20. AUTHORS
  21. BUILD.gn
  22. CHANGELOG.md
  23. codereview.settings
  24. dartdoc_options.yaml
  25. DEPS
  26. LICENSE
  27. PATENTS
  28. PRESUBMIT.py
  29. README.dart-sdk
  30. README.md
  31. WATCHLISTS
README.md

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