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Instead of passing a startup message to the new isolate, pass all necessary information in to _startIsolate directly. The new isolate sends its control port and capabilities back to the parent. R=iposva@google.com Review URL: https://codereview.chromium.org//456983002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39423 260f80e4-7a28-3924-810f-c04153c831b5