Add SessionStateObserver with ActiveUserChanged()

chrome/browser/ui/ash/session_state_delegate_chromeos.h

Index: chrome/browser/ui/ash/session_state_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/session_state_delegate_chromeos.h b/chrome/browser/ui/ash/session_state_delegate_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..025713ff5124b9482e1f5454525d1c8a857fcf50
--- /dev/null
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.h
@@ -0,0 +1,56 @@
+// 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 CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_
+#define CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_
+
+#include "ash/session_state_delegate.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/observer_list.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
+
+namespace ash {
+class SessionStateObserver;
+}  // namespace ash
+
+class SessionStateDelegateChromeos
+    : public ash::SessionStateDelegate,
+      public chromeos::UserManager::UserSessionStateObserver {
+ public:
+  SessionStateDelegateChromeos();
+  virtual ~SessionStateDelegateChromeos();
+
+  // ash::SessionStateDelegate:
+  virtual int GetMaximumNumberOfLoggedInUsers() const OVERRIDE;
+  virtual int NumberOfLoggedInUsers() const OVERRIDE;
+  virtual bool IsActiveUserSessionStarted() const OVERRIDE;
+  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(ash::UserIdList* users) OVERRIDE;
+  virtual void SwitchActiveUser(const std::string& user_id) OVERRIDE;
+  virtual void AddSessionStateObserver(
+      ash::SessionStateObserver* observer) OVERRIDE;
+  virtual void RemoveSessionStateObserver(
+      ash::SessionStateObserver* observer) OVERRIDE;
+
+  // UserManager::UserSessionStateObserver:
+  virtual void ActiveUserChanged(const chromeos::User* active_user) OVERRIDE;
+
+ private:
+  // List of observers is only used on Chrome OS for now.
+  ObserverList<ash::SessionStateObserver> session_state_observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionStateDelegateChromeos);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_CHROMEOS_H_