<extensionoptions>: Add experimental attach/detach API

chrome/renderer/resources/extensions/extension_options.js

Index: chrome/renderer/resources/extensions/extension_options.js
diff --git a/chrome/renderer/resources/extensions/extension_options.js b/chrome/renderer/resources/extensions/extension_options.js
index 1b8fa7892bd56d6c5ad35eebdcac3273df59fc33..7709a1c0123035134df773297bf5a89aa3372366 100644
--- a/chrome/renderer/resources/extensions/extension_options.js
+++ b/chrome/renderer/resources/extensions/extension_options.js
@@ -46,6 +46,8 @@ ExtensionOptionsImpl.VIEW_TYPE = 'ExtensionOptions';
 // Add extra functionality to |this.element|.
 ExtensionOptionsImpl.setupElement = function(proto) {
   var apiMethods = [
+    'attach',
+    'detach',
     'setDeferAutoSize',
     'resumeDeferredAutoSize'
   ];
@@ -263,4 +265,32 @@ ExtensionOptionsImpl.prototype.resumeDeferredAutoSize = function() {
   }
 };
 
+/**
+ * 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);