cros: Show dircryto migration banner

chrome/browser/chromeos/login/screens/user_selection_screen.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 105 matching lines @@
   static bool ShouldForceOnlineSignIn(const user_manager::User* user);
 
  protected:
   UserBoardView* view_ = nullptr;
 
   // Map from public session account IDs to recommended locales set by policy.
   std::map<AccountId, std::vector<std::string>>
       public_session_recommended_locales_;
 
  private:
+  class DircryptoMigrationChecker;
+
   EasyUnlockService* GetEasyUnlockServiceForUser(
       const AccountId& account_id) const;
 
   void OnUserStatusChecked(const AccountId& account_id,
                            TokenHandleUtil::TokenHandleStatus status);
 
   LoginDisplayWebUIHandler* handler_ = nullptr;
   LoginDisplay::Delegate* login_display_delegate_ = nullptr;
 
   // Whether to show guest login.
   bool show_guest_ = false;
 
   // Purpose of the screen (see constants in OobeUI).
   const std::string display_type_;
 
   // Set of Users that are visible.
   user_manager::UserList users_;
 
   // Map of accounnt ids to their current authentication type. If a user is not
   // contained in the map, it is using the default authentication type.
   std::map<AccountId, proximity_auth::ScreenlockBridge::LockHandler::AuthType>
       user_auth_type_map_;
 
   // Timer for measuring idle state duration before password clear.
   base::OneShotTimer password_clear_timer_;
 
   // Token handler util for checking user OAuth token status.
   std::unique_ptr<TokenHandleUtil> token_handle_util_;
 
+  // Helper to check whether a user needs dircrypto migration.
+  std::unique_ptr<DircryptoMigrationChecker> dircrypto_migration_checker_;
+
   base::WeakPtrFactory<UserSelectionScreen> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserSelectionScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_