Properly detect whether we're running on a buildbot.

pkg/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 test pass,
  * you should only see a couple lines in the terminal. If a test fails, the
  * failure is shown and the progress bar continues to be updated below it.
  */
@@ skipping 172 matching lines @@
     if (firstSpace > 0) {
       res = res.substring(firstSpace);
     }
     return '...$res';
   }
 }
 
 void useCompactVMConfiguration() {
   // 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.containsKey('BUILDBOT_BUILDERNAME')) {
+  if (Platform.environment['LOGNAME'] == 'chrome-bot') {

[Siggi Cherem (dart-lang), 2013/11/12 20:05:57]

does this work in windows/mac as well? IIRC, BUILDBOT_BUILDERNAME is used in all
platforms (true, as long as it's running annotated steps) Do you know which bots
don't use that?

[nweiz, 2013/11/12 20:11:11]

According to Rico, LOGNAME should work everywhere.

It looks like none of the VM bots except cross-arm-vm-linux-release use
annotated steps.

     return;
   }
 
   unittestConfiguration = _singleton;
 }
 
 final _singleton = new CompactVMConfiguration();