Roll Observatory packages and add a roll script

packages/unittest/lib/compact_vm_config.dart

 // Copyright (c) 2013, 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.
 
 /// A test configuration that generates a compact 1-line progress bar. The bar
 /// is updated in-place before and after each test is executed. If all tests
 /// pass, only a couple of lines are printed in the terminal. If a test fails,
 /// the failure is shown and the progress bar continues to be updated below it.
 library unittest.compact_vm_config;
 
@@ skipping 194 matching lines @@
   // If the test is running on the Dart buildbots, we don't want to use this
   // config since it's output may not be what the bots expect.
   if (Platform.environment['LOGNAME'] == 'chrome-bot') {
     return;
   }
 
   unittestConfiguration = _singleton;
 }
 
 final _singleton = new CompactVMConfiguration();