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When a port is specified, user may navigate to localhost:$port/status to see the status of analysis. Intended for internal debugging of analysis server only. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//679113006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@41349 260f80e4-7a28-3924-810f-c04153c831b5