Build Observatory as part of runtime

tools/canary.dart

Index: tools/canary.dart
diff --git a/samples-dev/swarm/swarm.dart b/tools/canary.dart
similarity index 55%
copy from samples-dev/swarm/swarm.dart
copy to tools/canary.dart
index d44bd2be8419fc03e53fae74b6c538c3fee638d8..cca1f90cd7be8eb2481a00a89bbc7ba7edaa6d4f 100644
--- a/samples-dev/swarm/swarm.dart
+++ b/tools/canary.dart
@@ -1,11 +1,11 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library swarm;
+// Script which exits with code 42.
 
-import 'swarmlib.dart';
+import 'dart:io';
 
 void main() {
-  new Swarm().run();
+  exitCode = 42;
 }