Run all tests inside an iframe + restrict number of chrome browser processes on mac

tools/test.dart

 #!/usr/bin/env 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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
  *     2. the dart2js compiler
  *     3. the static analyzer
  *     4. the dart core library
  *     5. other standard dart libraries (DOM bindings, ui libraries,
  *            io libraries etc.)
  *
  * This script is normally invoked by test.py.  (test.py finds the dart vm
  * and passses along all command line arguments to this script.)
  *
  * The command line args of this script are documented in
  * "tools/testing/test_options.dart".
  *
  */
 
 library test;
 
 import "dart:async";
 import "dart:io";
+import "dart:math" as math;
 import "testing/dart/browser_controller.dart";
 import "testing/dart/http_server.dart";
 import "testing/dart/test_options.dart";
 import "testing/dart/test_progress.dart";
 import "testing/dart/test_runner.dart";
 import "testing/dart/test_suite.dart";
 import "testing/dart/utils.dart";
 
 import "../runtime/tests/vm/test_config.dart";
 import "../tests/co19/test_config.dart";
@@ skipping 123 matching lines @@
       // is that windows does not handle the IE processes independently.
       // If we have more than one browser and kill a browser we are seeing
       // issues with starting up a new browser just after killing the hanging
       // browser.
       maxBrowserProcesses = 1;
     } else if (conf['runtime'].startsWith('safari') &&
                conf['use_browser_controller']) {
       // Safari does not allow us to run from a fresh profile, so we can only
       // use one browser.
       maxBrowserProcesses = 1;
+    } else if (conf['runtime'] == 'chrome' &&
+               conf['use_browser_controller'] &&
+               Platform.operatingSystem == 'macos') {
+      // Chrome on mac results in random timeouts.
+      maxBrowserProcesses = math.max(1, maxBrowserProcesses ~/ 2);
     }
 
     for (String key in selectors.keys) {
       if (key == 'co19') {
         testSuites.add(new Co19TestSuite(conf));
       } else if (conf['runtime'] == 'vm' && key == 'vm') {
         // vm tests contain both cc tests (added here) and dart tests (added
         // in [TEST_SUITE_DIRECTORIES]).
         testSuites.add(new VMTestSuite(conf));
       } else if (conf['analyzer']) {
@@ skipping 99 matching lines @@
 void main() {
   deleteTemporaryDartDirectories().then((_) {
     var optionsParser = new TestOptionsParser();
     var configurations = optionsParser.parse(new Options().arguments);
     if (configurations != null && configurations.length > 0) {
       testConfigurations(configurations);
     }
   });
 }