Initialize OOBE/login WebUI in hidden state in parallel with wallpaper animation.

chrome/browser/chromeos/login/webui_login_display_host.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 49 matching lines @@
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   // Overridden from content::WebContentsObserver:
   virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
 
   // Loads given URL. Creates WebUILoginView if needed.
   void LoadURL(const GURL& url);
 
+  // Shows OOBE/sign in WebUI that was previously initialized in hidden state.
+  void ShowWebUI();
+
   // Starts postponed WebUI (OOBE/sign in) if it was waiting for
   // wallpaper animation end.
   void StartPostponedWebUI();
 
   // Container of the screen we are displaying.
   views::Widget* login_window_;
 
   // Container of the view we are displaying.
   WebUILoginView* login_view_;
 
   // Login display we are using.
   WebUILoginDisplay* webui_login_display_;
 
   // True if the login display is the current screen.
   bool is_showing_login_;
 
   // True if NOTIFICATION_WALLPAPER_ANIMATION_FINISHED notification has been
   // received.
   bool is_wallpaper_loaded_;
 
+  // True if WebUI is initialized hidden in parallel with wallpaper animation.
+  // Otherwise it is postponed and only starts initializing when animation
+  // finishes. Makes sense only if |waiting_for_wallpaper_load_| is true.
+  // By default is true. Could be used to tune performance if needed.
+  bool initialize_webui_in_parallel_;
+
+  // Stores status area current visibility to be applied once login WebUI
+  // is shown.
+  bool status_area_saved_visibility_;
+
   // True if should not show WebUI on first StartWizard/StartSignInScreen call
   // but wait for wallpaper load animation to finish.
-  // Used in OOBE (first boot, boot after update) i.e. till
-  // device is marked as registered to postpone loading OOBE screen / sign in.
+  // OOBE/sign in WebUI is either initialized hidden or postponed i.e. loaded
+  // only when wallpaper animation finishes.
   bool waiting_for_wallpaper_load_;
 
   content::NotificationRegistrar registrar_;
 
   // How many times renderer has crashed.
   int crash_count_;
 
   // Way to restore if renderer have crashed.
   enum {
     RESTORE_UNKNOWN,
     RESTORE_WIZARD,
     RESTORE_SIGN_IN
   } restore_path_;
 
   // Stored parameters for StartWizard, required to restore in case of crash.
   std::string wizard_first_screen_name_;
   scoped_ptr<DictionaryValue> wizard_screen_parameters_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUILoginDisplayHost);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_LOGIN_DISPLAY_HOST_H_