ash: Replace SessionStateDelegate::CanAddUserToMultiProfile

ash/common/session/session_state_delegate.h

 // Copyright 2015 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 ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_
 #define ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/session/session_types.h"
 #include "components/session_manager/session_manager_types.h"
@@ skipping 15 matching lines @@
 
 // Delegate for checking and modifying the session state.
 class ASH_EXPORT SessionStateDelegate {
  public:
   // Defines the cycle direction for |CycleActiveUser|.
   enum CycleUser {
     CYCLE_TO_NEXT_USER = 0,  // Cycle to the next user.
     CYCLE_TO_PREVIOUS_USER,  // Cycle to the previous user.
   };
 
-  enum AddUserError {
-    ADD_USER_ERROR_NOT_ALLOWED_PRIMARY_USER = 0,
-    ADD_USER_ERROR_OUT_OF_USERS,
-    ADD_USER_ERROR_MAXIMUM_USERS_REACHED,
-  };
-
   virtual ~SessionStateDelegate() {}
 
   // Returns the maximum possible number of logged in users.
   virtual int GetMaximumNumberOfLoggedInUsers() const = 0;
 
   // Returns the number of signed in users. If 0 is returned, there is either
   // no session in progress or no active user.
   virtual int NumberOfLoggedInUsers() const = 0;
 
-  // Returns true if there is possible to add more users to multiprofile
-  // session. Error is stored in |error| if it is not NULL and function
-  // returned false.
-  virtual bool CanAddUserToMultiProfile(AddUserError* error) const;
+  // Gets the policy of adding a user session to ash.
+  virtual AddUserSessionPolicy GetAddUserSessionPolicy() const;
 
   // Returns |true| if the session has been fully started for the active user.
   // When a user becomes active, the profile and browser UI are not immediately
   // available. Only once this method starts returning |true| is the browser
   // startup complete and both profile and UI are fully available.
   virtual bool IsActiveUserSessionStarted() const = 0;
 
   // Returns true if the screen can be locked.
   virtual bool CanLockScreen() const = 0;
 
@@ skipping 43 matching lines @@
   // Adds or removes sessions state observer.
   virtual void AddSessionStateObserver(SessionStateObserver* observer) = 0;
   virtual void RemoveSessionStateObserver(SessionStateObserver* observer) = 0;
 
   bool IsInSecondaryLoginScreen() const;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SESSION_SESSION_STATE_DELEGATE_H_