Restore last used user session after crash

components/user_manager/user_manager.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_H_
 #define COMPONENTS_USER_MANAGER_USER_MANAGER_H_
 
 #include <string>
 
 #include "components/user_manager/user.h"
@@ skipping 127 matching lines @@
   // |browser_restart| is true when reloading Chrome after crash to distinguish
   // from normal sign in flow.
   // |username_hash| is used to identify homedir mount point.
   virtual void UserLoggedIn(const std::string& user_id,
                             const std::string& username_hash,
                             bool browser_restart) = 0;
 
   // Switches to active user identified by |user_id|. User has to be logged in.
   virtual void SwitchActiveUser(const std::string& user_id) = 0;
 
+  // Switches to the last active user (called after crash happens and session
+  // restore has completed).
+  virtual void SwitchToLastActiveUser() = 0;
+
   // Called when browser session is started i.e. after
   // browser_creator.LaunchBrowser(...) was called after user sign in.
   // When user is at the image screen IsUserLoggedIn() will return true
   // but IsSessionStarted() will return false. During the kiosk splash screen,
   // we perform additional initialization after the user is logged in but
   // before the session has been started.
   // Fires NOTIFICATION_SESSION_STARTED.
   virtual void SessionStarted() = 0;
 
   // Removes the user from the device. Note, it will verify that the given user
@@ skipping 149 matching lines @@
   static UserManager* GetForTesting();
 
   // Sets UserManager instance to the given |user_manager|.
   // Returns the previous value of the instance.
   static UserManager* SetForTesting(UserManager* user_manager);
 };
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_USER_MANAGER_H_