Add timeouts for browser connections.

lib/src/runner/browser/server.dart

 // Copyright (c) 2015, 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.runner.browser.server;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:pool/pool.dart';
 import 'package:shelf/shelf.dart' as shelf;
 import 'package:shelf/shelf_io.dart' as shelf_io;
 import 'package:shelf_static/shelf_static.dart';
 import 'package:shelf_web_socket/shelf_web_socket.dart';
 
 import '../../backend/metadata.dart';
 import '../../backend/suite.dart';
 import '../../backend/test_platform.dart';
 import '../../util/io.dart';
 import '../../util/path_handler.dart';
 import '../../util/one_off_handler.dart';
 import '../../utils.dart';
+import '../application_exception.dart';
 import '../load_exception.dart';
 import 'browser.dart';
 import 'browser_manager.dart';
 import 'compiler_pool.dart';
 import 'chrome.dart';
 import 'dartium.dart';
 import 'content_shell.dart';
 import 'firefox.dart';
 import 'phantom_js.dart';
 import 'safari.dart';
@@ skipping 315 matching lines @@
     }), platform);
     _browsers[platform] = browser;
 
     // TODO(nweiz): Gracefully handle the browser being killed before the
     // tests complete.
     browser.onExit.catchError((error, stackTrace) {
       if (completer.isCompleted) return;
       completer.completeError(error, stackTrace);
     });
 
-    return completer.future;
+    return completer.future.timeout(new Duration(seconds: 7), onTimeout: () {
+      throw new ApplicationException(
+          "Timed out waiting for ${platform.name} to connect.");
+    });
   }
 
   /// Starts the browser identified by [browser] and has it load [url].
   Browser _newBrowser(Uri url, TestPlatform browser) {
     switch (browser) {
       case TestPlatform.dartium: return new Dartium(url);
       case TestPlatform.contentShell: return new ContentShell(url);
       case TestPlatform.chrome: return new Chrome(url);
       case TestPlatform.phantomJS: return new PhantomJS(url);
       case TestPlatform.firefox: return new Firefox(url);
@@ skipping 24 matching lines @@
       if (_pubServeUrl == null) {
         new Directory(_compiledDir).deleteSync(recursive: true);
       } else {
         _http.close();
       }
 
       _closeCompleter.complete();
     }).catchError(_closeCompleter.completeError);
   }
 }