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Analysis.getError now has the following behaviors: - If the file in question does not exist, or is not subject to analysis, a new error called GET_ERRORS_INVALID_FILE is generated. - If the server's internal state (the set of active analysis contexts) changes while the query is in process, the query is transparently restarted; the client no longer receives a GET_ERRORS_ERROR error. R=scheglov@google.com Review URL: https://codereview.chromium.org//532403002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39871 260f80e4-7a28-3924-810f-c04153c831b5