Support for running a limited amount of browser tests in parallel

tools/test.dart

 #!/usr/bin/env dart
 // Copyright (c) 2012, 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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
@@ skipping 137 matching lines @@
             new StandardTestSuite.forDirectory(conf, testSuiteDir,
             serverList: TestingServerRunner.serverList));
       }
     }
   }
 
   void allTestsFinished() {
     TestingServerRunner.terminateHttpServers();
     DebugLogger.close();
   }
+  var maxBrowserProcesses =

[ricow1, 2013/01/24 09:04:28]

Add a comment as to why we do this

[kustermann, 2013/01/29 08:43:32]

Done.

+      firstConf['runtime'].contains('ie') ? 1 : maxProcesses;
 
   // Start process queue.
   new ProcessQueue(maxProcesses,
+                   maxBrowserProcesses,
                    progressIndicator,
                    startTime,
                    printTiming,
                    testSuites,
                    allTestsFinished,
                    verbose,
                    listTests);
 }