Increase timeout to see if "timeout" errors on Windows bot goes away. Otherwise,

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 545 matching lines @@
           }
           if (configuration['host_checked']) {
             timeout *= 16;
           }
           if (configuration['checked']) {
             timeout *= 2;
           }
           if (Contains(configuration['runtime'],
                        const ['ie9', 'ie10', 'ff', 'chrome', 'safari',
                               'opera'])) {
-            timeout *= 8; // Allow additional time for browser testing to run.
+            // TODO(ahe): Restore the timeout to 8 times the original timeout

[Jennifer Messerly, 2012/10/23 21:05:55]

might want to leave this TODO(efortuna)? (not that you'll be the one that fixes
it -- just that you can explain it). I dunno how Peter feels about having his
name added to TODOs, if ya'll have done this before, it's fine with me :)

+            // when dart2js compile-time performance has improved.
+            timeout *= 12; // Allow additional time for browser testing to run.
           }
           break;
         default:
           if (configuration['mode'] == 'debug') {
             timeout *= 2;
           }
           if (Contains(configuration['runtime'], const ['drt', 'dartium'])) {
             timeout *= 4; // Allow additional time for browser testing to run.
           }
           break;
@@ skipping 72 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }