<webview>, <appview> and <extensionoptions> can run in a detached state.

extensions/renderer/resources/guest_view/surface_view.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This module implements the SurfaceView prototype.
 
 var GuestView = require('guestView').GuestView;
 var GuestViewContainer = require('guestViewContainer').GuestViewContainer;
 
 function SurfaceViewImpl(surfaceviewElement) {
   GuestViewContainer.call(this, surfaceviewElement, 'surfaceview');
 }
 
 SurfaceViewImpl.prototype.__proto__ = GuestViewContainer.prototype;
 
 SurfaceViewImpl.VIEW_TYPE = 'SurfaceView';
 
 // Add extra functionality to |this.element|.
 SurfaceViewImpl.setupElement = function(proto) {
   var apiMethods = [
     'connect'
   ];
 
   // Forward proto.foo* method calls to SurfaceViewImpl.foo*.
   GuestViewContainer.forwardApiMethods(proto, apiMethods);
 }
 
+SurfaceViewImpl.prototype.buildContainerParams = function() {
+  return { 'url': this.url };
+};
+
 SurfaceViewImpl.prototype.connect = function(url, callback) {
   if (!this.elementAttached) {
     if (callback) {
       callback(false);
     }
     return;
   }
 
+  this.url = url;
+
   this.guest.destroy();
 
-  var createParams = {
-    'url': url
-  };
-
-  this.guest.create(createParams, function() {
+  this.guest.create(this.buildParams(), function() {
     this.attachWindow();
     if (callback) {
       callback(true);
     }
   }.bind(this));
 };
 
 GuestViewContainer.registerElement(SurfaceViewImpl);