Third time's the charm...

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 234 matching lines @@
   Process process;
   TestCase testCase;
   bool timedOut = false;
   Date startTime;
   Timer timeoutTimer;
   List<String> stdout;
   List<String> stderr;
   List<Function> handlers;
   bool allowRetries = false;
 
   RunningProcess(TestCase this.testCase, [this.allowRetries]);

[Siggi Cherem (dart-lang), 2012/02/17 22:04:13]

The alternative is to do it here:
 RunningProcess(TestCase this.testCase, [allowRetries=false]) : _allowRetries =
allowRetries;
(assuming we rename the field to _allowRetries)

 
   void exitHandler(int exitCode) {
     new TestOutput(testCase, exitCode, timedOut, stdout,
                    stderr, new Date.now().difference(startTime));
     process.close();
     timeoutTimer.cancel();
     if (testCase.output.unexpectedOutput && testCase.configuration['verbose']) {
       print(testCase.displayName);
       for (var line in testCase.output.stderr) print(line);
       for (var line in testCase.output.stdout) print(line);
     }
-    if (allowRetries && testCase.configuration['component'] == 'webdriver' &&
+    if (allowRetries != null && allowRetries 
+        && testCase.configuration['component'] == 'webdriver' &&
         testCase.output.unexpectedOutput && testCase.numRetries > 0) {
       // Selenium tests can be flaky. Try rerunning.
       testCase.output.requestRetry = true;
     }
     if (testCase.output.requestRetry) {
       testCase.output.requestRetry = false;
       this.timedOut = false;
       testCase.dynamic.numRetries--;
       print("Potential flake. Re-running " + testCase.displayName);
       this.start();
@@ skipping 438 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.
         new RunningProcess(test, 
             _MAX_FAILED_NO_RETRY > _progress.numFailedTests).start();
       }
       _numProcesses++;
     }
   }
 }