Add SessionStateObserver with ActiveUserChanged()

ash/test/test_session_state_delegate.h

 // Copyright (c) 2013 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_TEST_TEST_SESSION_STATE_DELEGATE_H_
 #define ASH_TEST_TEST_SESSION_STATE_DELEGATE_H_
 
 #include "ash/session_state_delegate.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 17 matching lines @@
   virtual bool CanLockScreen() const OVERRIDE;
   virtual bool IsScreenLocked() const OVERRIDE;
   virtual void LockScreen() OVERRIDE;
   virtual void UnlockScreen() OVERRIDE;
   virtual const base::string16 GetUserDisplayName(
       ash::MultiProfileIndex index) const OVERRIDE;
   virtual const std::string GetUserEmail(
       ash::MultiProfileIndex index) const OVERRIDE;
   virtual const gfx::ImageSkia& GetUserImage(
       ash::MultiProfileIndex index) const OVERRIDE;
-  virtual void GetLoggedInUsers(UserEmailList* users) OVERRIDE;
+  virtual void GetLoggedInUsers(UserIdList* users) OVERRIDE;
   virtual void SwitchActiveUser(const std::string& email) OVERRIDE;
+  virtual void AddSessionStateObserver(
+      ash::SessionStateObserver* observer) OVERRIDE;
+  virtual void RemoveSessionStateObserver(
+      ash::SessionStateObserver* observer) OVERRIDE;
 
   // Updates the internal state that indicates whether a session is in progress
   // and there is an active user. If |has_active_user| is |false|,
   // |active_user_session_started_| is reset to |false| as well (see below for
   // the difference between these two flags).
   void SetHasActiveUser(bool has_active_user);
 
   // Updates the internal state that indicates whether the session has been
   // fully started for the active user. If |active_user_session_started| is
   // |true|, |has_active_user_| is set to |true| as well (see below for the
@@ skipping 30 matching lines @@
   // A test user image.
   gfx::ImageSkia null_image_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSessionStateDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SESSION_STATE_DELEGATE_H_