Restore last used user session after crash

components/user_manager/user_manager_base.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 COMPONENTS_USER_MANAGER_USER_MANAGER_BASE_H_
 #define COMPONENTS_USER_MANAGER_USER_MANAGER_BASE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 34 matching lines @@
   // UserManager implementation:
   virtual void Shutdown() OVERRIDE;
   virtual const UserList& GetUsers() const OVERRIDE;
   virtual const UserList& GetLoggedInUsers() const OVERRIDE;
   virtual const UserList& GetLRULoggedInUsers() const OVERRIDE;
   virtual const std::string& GetOwnerEmail() const OVERRIDE;
   virtual void UserLoggedIn(const std::string& user_id,
                             const std::string& user_id_hash,
                             bool browser_restart) OVERRIDE;
   virtual void SwitchActiveUser(const std::string& user_id) OVERRIDE;
+  virtual void SwitchToLastActiveUser() OVERRIDE;
   virtual void SessionStarted() OVERRIDE;
   virtual void RemoveUser(const std::string& user_id,
                           RemoveUserDelegate* delegate) OVERRIDE;
   virtual void RemoveUserFromList(const std::string& user_id) OVERRIDE;
   virtual bool IsKnownUser(const std::string& user_id) const OVERRIDE;
   virtual const User* FindUser(const std::string& user_id) const OVERRIDE;
   virtual User* FindUserAndModify(const std::string& user_id) OVERRIDE;
   virtual const User* GetLoggedInUser() const OVERRIDE;
   virtual User* GetLoggedInUser() OVERRIDE;
   virtual const User* GetActiveUser() const OVERRIDE;
@@ skipping 297 matching lines @@
   ObserverList<UserManager::UserSessionStateObserver>
       session_state_observer_list_;
 
   // Time at which this object was created.
   base::TimeTicks manager_creation_time_;
 
   // ID of the user just added to the session that needs to be activated
   // as soon as user's profile is loaded.
   std::string pending_user_switch_;
 
+  // ID of the user that was active in the previous session.
+  // Preference value is stored here before first user signs in
+  // because pref will be overidden once session restore starts.
+  std::string last_session_active_user_;
+  bool last_session_active_user_initialized_;
+
   // TaskRunner for UI thread.
   scoped_refptr<base::TaskRunner> task_runner_;
 
   // TaskRunner for SequencedWorkerPool.
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
   base::WeakPtrFactory<UserManagerBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerBase);
 };
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_USER_MANAGER_BASE_H_