Allow Observatory to run as a hosted web service

runtime/bin/vmservice/client/lib/src/app/location_manager.dart

 // Copyright (c) 2013, 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.
 
 part of app;
 
 abstract class LocationManager extends Observable {
   final _initialPath = '/vm';
   ObservatoryApplication _app;
 
   String _lastUrl;
 
   void _init(ObservatoryApplication app) {
     // Called once.
     assert(_app == null);
     _app = app;
     // Register for history events.
     window.onPopState.listen(_onLocationChange);
     _onStartup();
   }
 
   void _onStartup();
   void _onLocationChange(PopStateEvent event);
 
-  /// Go to a specific url.
-  void go(String url) {
+  void _pushUrl(String url) {
     if (_lastUrl != url) {
       Logger.root.info('Navigated to ${url}');
       window.history.pushState(url, document.title, url);
       _lastUrl = url;
     }
+  }
+
+  /// Go to a specific url.
+  void go(String url) {
+    if (_app.vm == null) {
+      url = makeLink('/vm-connect/');
+    }
+    _pushUrl(url);
     _go(url);
   }
 
   void _go(String url) {
     // Chop off leading '#'.
     if (url.startsWith('#')) {
       url = url.substring(1);
     }
     // Fall through handles '#/'
     // Chop off leading '/'.
@@ skipping 18 matching lines @@
   }
 
   /// Go forward.
   void forward() {
     window.history.go(1);
   }
 
   /// Handle clicking on an application url link.
   void onGoto(MouseEvent event, var detail, Element target) {
     var href = target.attributes['href'];
-    if (event.button > 1 || event.metaKey || event.ctrlKey ||
+    if (event.button > 0 || event.metaKey || event.ctrlKey ||
         event.shiftKey || event.altKey) {
       // Not a left-click or a left-click with a modifier key:
       // Let browser handle.
       return;
     }
-    location.go(href);
+    go(href);
     event.preventDefault();
   }
 
   /// Given an application url, generate a link.
   String makeLink(String url);
 }
 
 /// Uses location.hash to encode application urls.
 class HashLocationManager extends LocationManager {
   void _onStartup() {
@@ skipping 30 matching lines @@
     _go(window.location.pathname);
   }
 
   void _onLocationChange(PopStateEvent _) {
     _go(window.location.pathname);
   }
 
   /// Given an application url, generate a link for an anchor tag.
   String makeLink(String url) => url;
 }