Support passing in a test suite directory through a flag to the testing scripts

tools/testing/dart/test_options.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.
 
 library test_options_parser;
 
 import "dart:io";
 import "drt_updater.dart";
 import "test_suite.dart";
 import "compiler_configuration.dart" show CompilerConfiguration;
@@ skipping 408 matching lines @@
               ['--vm-options'],
               [],
               null),
           new _TestOptionSpecification(
               'dart2js_options',
               'Extra options for dart2js compilation step',
               ['--dart2js-options'],
               [],
               null),
           new _TestOptionSpecification(
+              'suite_dir',
+              'Additional directory to add to the testing matrix',
+              ['--suite-dir'],
+              [],
+              null),
+          new _TestOptionSpecification(
               'exclude_suite',
               'Exclude suites from default selector, only works when no'
               ' selector has been specified on the command line',
               ['--exclude-suite'],
               defaultTestSelectors,
               null),];
   }
 
 
   /**
@@ skipping 263 matching lines @@
       configuration['clear_browser_cache'] = true;
     }
 
     // Expand the test selectors into a suite name and a simple
     // regular expressions to be used on the full path of a test file
     // in that test suite. If no selectors are explicitly given use
     // the default suite patterns.
     var selectors = configuration['selectors'];
     if (selectors is !Map) {
       if (selectors == null) {
+        configuration['default_selector'] = true;
         selectors = new List.from(defaultTestSelectors);
         var exclude_suites = configuration['exclude_suite'] != null ?
               configuration['exclude_suite'].split(',') : [];
         for (var exclude in exclude_suites) {
           if (selectors.contains(exclude)) {
             selectors.remove(exclude);
           } else {
             print("Error: default selectors does not contain $exclude");
             exit(1);
           }
@@ skipping 131 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }