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If the periodic timer gets starved long enough, the timeout might happen. If the 5ms periodic timer hasn't triggered in 250ms, discard the test (i.e., don't fail anyway). R=ajohnsen@google.com Review URL: https://codereview.chromium.org//137143014 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32054 260f80e4-7a28-3924-810f-c04153c831b5