Added support for logging the output of failed flaky tests.

tools/testing/dart/test_options.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.
 
 #library("test_options_parser");
 
 #import("dart:io");
 #import("dart:math");
 #import("drt_updater.dart");
 #import("test_suite.dart");
@@ skipping 250 matching lines @@
               ['--use-sdk'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
               'noBatch',
               'Do not run browser tests in batch mode',
               ['-n', '--nobatch'],
               [],
               false,
-              'bool')];
+              'bool'),
+          new _TestOptionSpecification(
+              'append_flaky_log',
+              'Do not delete the old flaky log but rather append to it.',
+              ['--append_flaky_log'],
+              [],
+              false,
+              'bool'
+              ),];
   }
 
 
   /**
    * Parse a list of strings as test options.
    *
    * Returns a list of configurations in which to run the
    * tests. Configurations are maps mapping from option keys to
    * values. When encountering the first non-option string, the rest
    * of the arguments are stored in the returned Map under the 'rest'
@@ skipping 376 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }