Big merge from experimental to bleeding edge.

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1654 matching lines @@
       }
     }
     return Futures.wait(futures);
   }
 
   BatchRunnerProcess _getBatchRunner(TestCase test) {
     // Start batch processes if needed
     var compiler = test.configuration['compiler'];
     var runners = _batchProcesses[compiler];
     if (runners == null) {
-      runners = new List<BatchRunnerProcess>(_maxProcesses);
+      runners = new List<BatchRunnerProcess>.fixedLength(_maxProcesses);
       for (int i = 0; i < _maxProcesses; i++) {
         runners[i] = new BatchRunnerProcess(test);
       }
       _batchProcesses[compiler] = runners;
     }
 
     for (var runner in runners) {
       if (!runner.active) return runner;
     }
     throw new Exception('Unable to find inactive batch runner.');
@@ skipping 52 matching lines @@
         // the developer doesn't waste his or her time trying to fix a bunch of
         // tests that appear to be broken but were actually just flakes that
         // didn't get retried because there had already been one failure.
         bool allowRetry = _MAX_FAILED_NO_RETRY > _progress.numFailedTests;
         new RunningProcess(test, allowRetry, this).start();
       }
       _numProcesses++;
     }
   }
 }