<extensionoptions>: Add experimental attach/detach API

chrome/renderer/resources/extensions/extension_options.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.
 
 var DocumentNatives = requireNative('document_natives');
 var ExtensionOptionsEvents =
     require('extensionOptionsEvents').ExtensionOptionsEvents;
 var GuestView = require('guestView').GuestView;
 var GuestViewContainer = require('guestViewContainer').GuestViewContainer;
 var GuestViewInternal =
@@ skipping 28 matching lines @@
   this.setupElementProperties();
 };
 
 ExtensionOptionsImpl.prototype.__proto__ = GuestViewContainer.prototype;
 
 ExtensionOptionsImpl.VIEW_TYPE = 'ExtensionOptions';
 
 // Add extra functionality to |this.element|.
 ExtensionOptionsImpl.setupElement = function(proto) {
   var apiMethods = [
+    'attach',
+    'detach',
     'setDeferAutoSize',
     'resumeDeferredAutoSize'
   ];
 
   // Forward proto.foo* method calls to ExtensionOptionsImpl.foo*.
   GuestViewContainer.forwardApiMethods(proto, apiMethods);
 }
 
 ExtensionOptionsImpl.prototype.onElementAttached = function() {
   this.createGuest();
@@ skipping 197 matching lines @@
  */
 ExtensionOptionsImpl.prototype.resumeDeferredAutoSize = function() {
   if (this.autosizeDeferred) {
     this.resize(this.deferredAutoSizeState.newWidth,
                 this.deferredAutoSizeState.newHeight,
                 this.deferredAutoSizeState.oldWidth,
                 this.deferredAutoSizeState.oldHeight);
   }
 };
 
+/**
+ * Attaches a guest to this <extensionoptions> element.
+ */
+ExtensionOptionsImpl.prototype.attach = function(guest) {
+  if (this.guest === guest) {
+    return;
+  }
+  this.guest.destroy();
+  this.guest = guest;
+  this.attachWindow();
+};
+
+/**
+ * Detaches the guest from this <extensionoptions> element.
+ */
+ExtensionOptionsImpl.prototype.detach = function() {
+  // If we don't have a WindowProxy to this guest, then there's nothing to
+  // detach.
+  if (!this.guest.getContentWindow()) {
+    return null;
+  }
+  var guest = this.guest;
+  guest.detach();
+
+  this.guest = new GuestView('extensionoptions');
+  return guest;
+};
+
 GuestViewContainer.registerElement(ExtensionOptionsImpl);