Switch from DRT to content shell.

pkg/args/example/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.
 
 /**
  * This is an example of converting the args in test.dart to use this API.
  * It shows what it looks like to build an [ArgParser] and then, when the code
  * is run, demonstrates what the generated usage text looks like.
  */
 library example;
@@ skipping 22 matching lines @@
           '(only valid with the following runtimes: none)',
       });
 
   parser.addOption('runtime', abbr: 'r', defaultsTo: 'vm',
       help: 'Where the tests should be run.',
       allowed: ['vm', 'd8', 'drt', 'dartium', 'ff', 'firefox', 'chrome',
               'safari', 'ie', 'opera', 'none'],
       allowedHelp: {
         'vm': 'Run Dart code on the standalone dart vm.',
         'd8': 'Run JavaScript from the command line using v8.',
+        // TODO(antonm): rename flag.
         'drt': 'Run Dart or JavaScript in the headless version of Chrome,\n'
-          'DumpRenderTree.',
+          'content shell.',
         'dartium': 'Run Dart or JavaScript in Dartium.',
         'ff': 'Run JavaScript in Firefox',
         'chrome': 'Run JavaScript in Chrome',
         'safari': 'Run JavaScript in Safari',
         'ie': 'Run JavaScript in Internet Explorer',
         'opera': 'Run JavaScript in Opera',
         'none': 'No runtime, compile only (for example, used for dartc static\n'
           'analysis tests).',
       });
 
@@ skipping 54 matching lines @@
 For example if the normal command that will be executed
 is 'dart file.dart' and you specify special command
 'python -u valgrind.py @ suffix' the final command will be
 'python -u valgrind.py dart file.dart suffix'""");
 
   parser.addFlag('time',
       help: 'Print timing information after running tests',
       defaultsTo: false);
 
   parser.addOption('dart',    help: 'Path to dart executable');
-  parser.addOption('drt',     help: 'Path to DumpRenderTree executable');
+  // TODO(antonm): rename the option.
+  parser.addOption('drt',     help: 'Path to content shell executable');
   parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
 
   parser.addFlag('batch', abbr: 'b',
       help: 'Run browser tests in batch mode',
       defaultsTo: true);
 
   print(parser.getUsage());
 }