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- Get access to dart:io internal signal listening function using API instead of mirrors. - Service isolate can start with service deactivated. - Load Observatory front end resources only when service activated. - Do not execute Dart Service code until service is activated. - Register live isolates when service is activated. - Startup refactored to allow for future use of script snapshots. R=asiva@google.com Review URL: https://codereview.chromium.org//533073005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40124 260f80e4-7a28-3924-810f-c04153c831b5