Added login screen mode for adding users into session.

chrome/browser/chromeos/login/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_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_HOST_H_
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/customization_document.h"
 #include "chrome/browser/chromeos/login/login_display.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace views {
 class Widget;
 }  // namespace views
 
@@ skipping 19 matching lines @@
 
   // Returns the current login view.
   virtual WebUILoginView* GetWebUILoginView() const = 0;
 
   // Returns corresponding widget.
   virtual views::Widget* GetWidget() const = 0;
 
   // Called when browsing session starts before creating initial browser.
   virtual void BeforeSessionStart() = 0;
 
-  // Called when browsing session starts so
+  // Called when user enters or returns to browsing session so
   // LoginDisplayHost instance may delete itself.
-  virtual void OnSessionStart() = 0;
+  virtual void Finalize() = 0;
 
   // Called when a login has completed successfully.
   virtual void OnCompleteLogin() = 0;
 
   // Open proxy settings dialog.
   virtual void OpenProxySettings() = 0;
 
   // Toggles OOBE progress bar visibility, the bar is hidden by default.
   virtual void SetOobeProgressBarVisible(bool visible) = 0;
 
@@ skipping 12 matching lines @@
   // One could specify start screen with |first_screen_name|.
   // Takes ownership of |screen_parameters|, which can also be NULL.
   virtual void StartWizard(
       const std::string& first_screen_name,
       scoped_ptr<DictionaryValue> screen_parameters) = 0;
 
   // Returns current WizardController, if it exists.
   // Result should not be stored.
   virtual WizardController* GetWizardController() = 0;
 
+  // Starts screen for adding user into session.

[Nikita (slow), 2013/05/28 11:34:22]

nit: Add comment on |completion_callback|.

[dzhioev (left Google), 2013/05/29 13:05:04]

Done.

+  virtual void StartUserAdding(const base::Closure& completion_callback) = 0;
+
   // Starts sign in screen.
   virtual void StartSignInScreen() = 0;
 
   // Resumes a previously started sign in screen.
   virtual void ResumeSignInScreen() = 0;
 
   // Invoked when system preferences that affect the signin screen have changed.
   virtual void OnPreferencesChanged() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_HOST_H_