Substantially increase browser timeouts.

lib/src/runner/browser/browser_manager.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.browser_manager;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:http_parser/http_parser.dart';
@@ skipping 90 matching lines @@
       suiteChannel.stream.listen((response) {
         if (response["type"] == "print") {
           print(response["line"]);
         } else {
           completer.complete(response);
         }
       }, onDone: () {
         if (!completer.isCompleted) completer.complete();
       });
 
-      return completer.future.timeout(new Duration(seconds: 15), onTimeout: () {
+      return completer.future.timeout(new Duration(minutes: 1), onTimeout: () {
         throw new LoadException(
             path,
             "Timed out waiting for the test suite to connect on "
                 "${browser.name}.");
       });
     });
 
     if (response == null) {
       closeIframe();
       return null;
@@ skipping 13 matching lines @@
     }
 
     return new Suite(response["tests"].map((test) {
       var testMetadata = new Metadata.deserialize(test['metadata']);
       var testChannel = suiteChannel.virtualChannel(test['channel']);
       return new IframeTest(test['name'], testMetadata, testChannel,
           mapper: mapper);
     }), metadata: metadata, path: path, onClose: () => closeIframe());
   }
 }