Added login screen mode for adding users into session.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

 // Copyright (c) 2013 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_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 54 matching lines @@
  protected:
   virtual ~LoginDisplayWebUIHandler() {}
 };
 
 // An interface for SigninScreenHandler to call WebUILoginDisplay.
 class SigninScreenHandlerDelegate {
  public:
   // Cancels current password changed flow.
   virtual void CancelPasswordChangedFlow() = 0;
 
+  // Cancels user adding.
+  virtual void CancelUserAdding() = 0;
+
   // Create a new Google account.
   virtual void CreateAccount() = 0;
 
   // Confirms sign up by provided credentials in |user_context|.
   // Used for new user login via GAIA extension.
   virtual void CompleteLogin(const UserContext& user_context) = 0;
 
   // Sign in using username and password specified as a part of |user_context|.
   // Used for both known and new users.
   virtual void Login(const UserContext& user_context) = 0;
@@ skipping 214 matching lines @@
   void HandleAccountPickerReady();
   void HandleWallpaperReady();
   void HandleLoginWebuiReady();
   void HandleDemoWebuiReady();
   void HandleSignOutUser();
   void HandleUserImagesLoaded();
   void HandleNetworkErrorShown();
   void HandleOpenProxySettings();
   void HandleLoginVisible(const std::string& source);
   void HandleCancelPasswordChangedFlow();
+  void HandleCancelUserAdding();
   void HandleMigrateUserData(const std::string& password);
   void HandleResyncUserData();
   void HandleLoginUIStateChanged(const std::string& source, bool new_value);
   void HandleUnlockOnLoginSuccess();
   void HandleLoginScreenUpdate();
   void HandleFrameLoadingCompleted(int status);
   void HandleShowLoadingTimeoutError();
   void HandleUpdateOfflineLogin(bool offline_login_active);
   void HandleShowLocallyManagedUserCreationScreen();
 
@@ skipping 127 matching lines @@
 
   // Testing helper, specifies new value for gaia url.
   GURL gaia_url_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_