Avoid timeouts in dart2js/release/checked.

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 533 matching lines @@
           timeout *= 4;
           break;
         case 'dart2js':
           timeout = 30;
           if (configuration['mode'] == 'debug') {
             timeout *= 8;
           }
           if (configuration['host_checked']) {
             timeout *= 16;
           }
+          if (configuration['checked']) {
+            timeout *= 2;
+          }
           if (Contains(configuration['runtime'],
                        const ['ie', 'ff', 'chrome', 'safari', 'opera'])) {
             timeout *= 8; // Allow additional time for browser testing to run.
           }
           break;
         default:
           if (configuration['mode'] == 'debug') {
             timeout *= 2;
           }
           if (Contains(configuration['runtime'], const ['drt', 'dartium'])) {
@@ skipping 75 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }