Add LoginState class to src/chromeos/login

chromeos/login/login_state.h

Index: chromeos/login/login_state.h
diff --git a/chromeos/login/login_state.h b/chromeos/login/login_state.h
new file mode 100644
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+++ b/chromeos/login/login_state.h
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+// 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 CHROMEOS_LOGIN_LOGIN_STATE_H_
+#define CHROMEOS_LOGIN_LOGIN_STATE_H_
+
+#include "base/observer_list.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/session_manager_client.h"
+
+namespace chromeos {
+
+// Tracks the login state of chrome, accessible to Ash and other chromeos code.
+class CHROMEOS_EXPORT LoginState : public SessionManagerClient::Observer {
+ public:
+  enum State {
+    LOGGED_IN_UNKNOWN,
+    LOGGED_IN_OOBE,             // Out of box experience not completed
+    LOGGED_IN_NONE,             // Not logged in
+    LOGGED_IN_LOCKED,           // A user has locked the screen
+    LOGGED_IN_USER,             // A normal user is logged in
+    LOGGED_IN_OWNER,            // The owner of the device is logged in
+    LOGGED_IN_GUEST,            // A guest is logged in (i.e. incognito)
+    LOGGED_IN_RETAIL_MODE,      // Is in retail mode
+    LOGGED_IN_PUBLIC,           // A public account is logged in
+    LOGGED_IN_LOCALLY_MANAGED,  // A locally managed user is logged in
+    LOGGED_IN_KIOSK_APP         // Is in kiosk app mode
+  };
+
+  class Observer {
+   public:
+    // Called when the login state changes.
+    virtual void LoginStateChanged(LoginState::State state) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  // Manage singleton instance. Must be initialized after DBusThreadManager.
+  static void Initialize();
+  static void Shutdown();
+  static LoginState* Get();
+
+  // Add/remove observers.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Set the base login state to |state|. Note, other factors (e.g. screen lock)
+  // may affect the result of GetLoginState().
+  void SetLoginState(LoginState::State state);
+
+  // Returns the current login state.
+  LoginState::State GetLoginState() const;
+
+  // Returns true if |state_| is a logged in state.
+  bool IsLoggedIn();
+
+ private:
+  LoginState();
+  virtual ~LoginState();
+
+  // SessionManagerClient::Observer
+  virtual void LockScreen() OVERRIDE;
+  virtual void UnlockScreen() OVERRIDE;
+
+  void NotifyObservers();
+
+  State state_;
+  bool screen_locked_;
+  ObserverList<LoginState::Observer> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoginState);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_LOGIN_LOGIN_STATE_H_