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No implementation yet just a rough of how the API might look. Note that how clients pass selection information into main (and get it back) is still TBD. Comments welcome! R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//24180004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@27586 260f80e4-7a28-3924-810f-c04153c831b5