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- new SERVER_ERROR response code - return SERVER_ERROR response if exception when processing request before request can be sent - send server.error notification if exception occurs anytime while processing request or future work triggered by request BUG=dartbug.com/20893 R=brianwilkerson@google.com, paulberry@google.com Review URL: https://codereview.chromium.org//570453002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40198 260f80e4-7a28-3924-810f-c04153c831b5