Add SessionStateObserver with ActiveUserChanged()

chrome/browser/chromeos/login/user_manager_impl.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_USER_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 244 matching lines @@
   // Updates the display name for public account |username| from policy settings
   // associated with that username.
   void UpdatePublicAccountDisplayName(const std::string& username);
 
   // Notifies the UI about a change to the user list.
   void NotifyUserListChanged();
 
   // Notifies observers that merge session state had changed.
   void NotifyMergeSessionStateChanged();
 
+  // Notifies observers that active user has changed.
+  void NotifyActiveUserChanged(const User* active_user);
+
   // Notifies observers that active user_id hash has changed.
   void NotifyActiveUserHashChanged(const std::string& hash);
 
   // Notifies observers that user pending sessions restore has finished.
   void NotifyPendingUserSessionsRestoreFinished();
 
   // Returns true if there is non-committed user creation transaction.
   bool HasFailedLocallyManagedUserCreationTransaction();
 
   // Attempts to clean up data that could be left from failed user creation.
@@ skipping 120 matching lines @@
   // User sessions that have to be restored after browser crash.
   // [user_id] > [user_id_hash]
   SessionManagerClient::ActiveSessionsMap pending_user_sessions_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_IMPL_H_