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

extensions/browser/guest_view/extension_options/extension_options_guest.cc

 // 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.
 
 #include "extensions/browser/guest_view/extension_options/extension_options_guest.h"
 
 #include "base/metrics/user_metrics.h"
 #include "base/values.h"
 #include "components/crx_file/id_util.h"
 #include "content/public/browser/navigation_details.h"
@@ skipping 24 matching lines @@
 
 // static
 const char ExtensionOptionsGuest::Type[] = "extensionoptions";
 
 ExtensionOptionsGuest::ExtensionOptionsGuest(
     content::WebContents* owner_web_contents,
     int guest_instance_id)
     : GuestView<ExtensionOptionsGuest>(owner_web_contents, guest_instance_id),
       extension_options_guest_delegate_(
           extensions::ExtensionsAPIClient::Get()
-              ->CreateExtensionOptionsGuestDelegate(this)),
-      has_navigated_(false) {
+              ->CreateExtensionOptionsGuestDelegate(this)) {
 }
 
 ExtensionOptionsGuest::~ExtensionOptionsGuest() {
 }
 
 // static
 extensions::GuestViewBase* ExtensionOptionsGuest::Create(
     content::WebContents* owner_web_contents,
     int guest_instance_id) {
   return new ExtensionOptionsGuest(owner_web_contents, guest_instance_id);
 }
 
+bool ExtensionOptionsGuest::CanRunInDetachedState() const {
+  return true;
+}
+
 void ExtensionOptionsGuest::CreateWebContents(
     const base::DictionaryValue& create_params,
     const WebContentsCreatedCallback& callback) {
   // Get the extension's base URL.
   std::string extension_id;
   create_params.GetString(extensionoptions::kExtensionId, &extension_id);
 
   if (!crx_file::id_util::IdIsValid(extension_id)) {
     callback.Run(nullptr);
     return;
@@ skipping 35 matching lines @@
   // Create a WebContents using the extension URL. The options page's
   // WebContents should live in the same process as its parent extension's
   // WebContents, so we can use |extension_url| for creating the SiteInstance.
   content::SiteInstance* options_site_instance =
       content::SiteInstance::CreateForURL(browser_context(), extension_url);
   WebContents::CreateParams params(browser_context(), options_site_instance);
   params.guest_delegate = this;
   callback.Run(WebContents::Create(params));
 }
 
-void ExtensionOptionsGuest::DidAttachToEmbedder() {
-  // We should not re-navigate on reattachment.
-  if (has_navigated_)
-    return;
-
-  web_contents()->GetController().LoadURL(options_page_,
-                                          content::Referrer(),
-                                          ui::PAGE_TRANSITION_LINK,
-                                          std::string());
-  has_navigated_ = true;
-}
-
 void ExtensionOptionsGuest::DidInitialize(
     const base::DictionaryValue& create_params) {
   extension_function_dispatcher_.reset(
       new extensions::ExtensionFunctionDispatcher(browser_context(), this));
   if (extension_options_guest_delegate_) {
     extension_options_guest_delegate_->DidInitialize();
   }
+  web_contents()->GetController().LoadURL(options_page_,
+                                          content::Referrer(),
+                                          ui::PAGE_TRANSITION_LINK,
+                                          std::string());
 }
 
 void ExtensionOptionsGuest::DidStopLoading() {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   DispatchEventToView(new GuestViewBase::Event(
       extension_options_internal::OnLoad::kEventName, args.Pass()));
 }
 
 const char* ExtensionOptionsGuest::GetAPINamespace() const {
   return extensionoptions::kAPINamespace;
 }
 
 int ExtensionOptionsGuest::GetTaskPrefix() const {
   return IDS_EXTENSION_TASK_MANAGER_EXTENSIONOPTIONS_TAG_PREFIX;
 }
 
 void ExtensionOptionsGuest::GuestSizeChangedDueToAutoSize(
     const gfx::Size& old_size,
     const gfx::Size& new_size) {
   extension_options_internal::SizeChangedOptions options;
   options.old_width = old_size.width();
   options.old_height = old_size.height();
   options.new_width = new_size.width();
   options.new_height = new_size.height();
   DispatchEventToView(new GuestViewBase::Event(
       extension_options_internal::OnSizeChanged::kEventName,
       options.ToValue()));
 }
 
+bool ExtensionOptionsGuest::IsAutoSizeSupported() const {
+  return true;
+}
+
+bool ExtensionOptionsGuest::IsPreferredSizeModeEnabled() const {
+  return true;
+}
+
 void ExtensionOptionsGuest::OnPreferredSizeChanged(const gfx::Size& pref_size) {
   extension_options_internal::PreferredSizeChangedOptions options;
   options.width = pref_size.width();
   options.height = pref_size.height();
   DispatchEventToView(new GuestViewBase::Event(
       extension_options_internal::OnPreferredSizeChanged::kEventName,
       options.ToValue()));
 }
 
-bool ExtensionOptionsGuest::IsAutoSizeSupported() const {
-  return true;
-}
-
-bool ExtensionOptionsGuest::IsPreferredSizeModeEnabled() const {
-  return true;
-}
-
 content::WebContents* ExtensionOptionsGuest::GetAssociatedWebContents() const {
   return web_contents();
 }
 
 content::WebContents* ExtensionOptionsGuest::OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) {
   if (!extension_options_guest_delegate_)
     return nullptr;
 
@@ skipping 73 matching lines @@
   return handled;
 }
 
 void ExtensionOptionsGuest::OnRequest(
     const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(params,
                                            web_contents()->GetRenderViewHost());
 }
 
 }  // namespace extensions