Add content shell support.

lib/src/runner/browser/static/host.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.host;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
+import 'dart:js' as js;
 
 import 'package:stack_trace/stack_trace.dart';
 import 'package:test/src/util/multi_channel.dart';
 import 'package:test/src/util/stream_channel.dart';
 
 // TODO(nweiz): test this once we can run browser tests.
 /// Code that runs in the browser and loads test suites at the server's behest.
 ///
 /// One instance of this runs for each browser. When the server tells it to load
 /// a test, it starts an iframe pointing at that test's code; from then on, it
@@ skipping 38 matching lines @@
 /// running". A new connection is also created whenever a test begins running to
 /// send status messages about its progress.
 ///
 /// It's of particular note that the suite's [MultiChannel] connection uses the
 /// host's purely as a transport layer; neither is aware that the other is also
 /// using [MultiChannel]. This is necessary, since the host doesn't share memory
 /// with the suites and thus can't share its [MultiChannel] with them, but it
 /// does mean that the server needs to be sure to nest its [MultiChannel]s at
 /// the same place the client does.
 void main() {
+  // This tells content_shell not to close immediately after the page has
+  // rendered.
+  var testRunner = js.context['testRunner'];
+  if (testRunner != null) testRunner.callMethod('waitUntilDone', []);
+
   runZoned(() {
     var serverChannel = _connectToServer();
     serverChannel.stream.listen((message) {
       assert(message['command'] == 'loadSuite');
       var suiteChannel = serverChannel.virtualChannel(message['channel']);
       var iframeChannel = _connectToIframe(message['url']);
       suiteChannel.pipe(iframeChannel);
     });
   }, onError: (error, stackTrace) {
     print("$error\n${new Trace.from(stackTrace).terse}");
@@ skipping 51 matching lines @@
     readyCompleter.complete();
   });
 
   outputController.stream.listen((message) {
     readyCompleter.future.then((_) =>
         iframe.contentWindow.postMessage(message, window.location.origin));
   });
 
   return new StreamChannel(inputController.stream, outputController.sink);
 }