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This will be needed for analysis server integration tests, so that they can start and stop the server in their setUp and tearDown methods. R=scheglov@google.com Review URL: https://codereview.chromium.org//393043005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@38260 260f80e4-7a28-3924-810f-c04153c831b5