Allow built in Observatory to work on any port

runtime/bin/vmservice/client/lib/service_html.dart

 // Copyright (c) 2014, 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 service_html;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
 
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 
 // Export the service library.
 export 'package:observatory/service.dart';
 
 class HttpVM extends VM {
-  final String address;
+  String host;
 
-  HttpVM(this.address) : super();
+  bool runningInJavaScript() => identical(1.0, 1);
+
+  HttpVM() : super() {
+    if (runningInJavaScript()) {
+      // When we are running as JavaScript use the same hostname:port
+      // that the Observatory is loaded from.
+      host = 'http://${window.location.host}/';
+    } else {
+      // Otherwise, assume we are running from the Dart Editor and
+      // want to connect on the defaul port.

[turnidge, 2014/03/21 19:48:45]

defaul -> default

+      host = 'http://127.0.0.1:8181/';
+    }
+  }
 
   Future<String> getString(String id) {
-    Logger.root.info('Fetching $id from $address');
-    return HttpRequest.getString(address + id).catchError((error) {
+    Logger.root.info('Fetching $id from $host');
+    return HttpRequest.getString(host + id).catchError((error) {
       // If we get an error here, the network request has failed.
       Logger.root.severe('HttpRequest.getString failed.');
       return JSON.encode({
           'type': 'Error',
           'id': '',
           'kind': 'NetworkError',
           'message': 'Could not connect to service. Check that you started the'
                      ' VM with the following flags:\n --enable-vm-service'
                     ' --pin-isolates'
         });
@@ skipping 29 matching lines @@
     message['id'] = idString;
     message['method'] = 'observatoryQuery';
     message['query'] = '/$path';
     _requestSerial++;
     var completer = new Completer();
     _outstandingRequests[idString] = completer;
     window.parent.postMessage(JSON.encode(message), '*');
     return completer.future;
   }
 }