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Allow imports with a metadata annotation. Allow test keys to be alphanumeric instead of just two digits. R=floitsch@google.com, whesse@google.com Committed: https://code.google.com/p/dart/source/detail?r=32892 Was reverted in Issue 175113002, commit r32894. Review URL: https://codereview.chromium.org//164333013 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32956 260f80e4-7a28-3924-810f-c04153c831b5