Add a LoadSuite class.

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 60 matching lines @@
       _channel.sink.add({
         "command": "loadSuite",
         "url": url.toString(),
         "channel": suiteChannel.id
       });
 
       // Create a nested MultiChannel because the iframe will be using a channel
       // wrapped within the host's channel.
       suiteChannel = new MultiChannel(suiteChannel.stream, suiteChannel.sink);
 
-      return maybeFirst(suiteChannel.stream)
-          .timeout(new Duration(seconds: 15), onTimeout: () {
+      var completer = new Completer();
+      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: () {
         throw new LoadException(
             path,
             "Timed out waiting for the test suite to connect on "
                 "${browser.name}.");
       });
     });
 
     if (response == null) return null;
 
     if (response["type"] == "loadException") {
       throw new LoadException(path, response["message"]);
     }
 
     if (response["type"] == "error") {
       var asyncError = RemoteException.deserialize(response["error"]);
       await new Future.error(
           new LoadException(path, asyncError.error),
           asyncError.stackTrace);
     }
 
     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);
   }
 }