[cros] Define session_manager component with SessionManager base class

components/session_manager/core/session_manager.h

Index: components/session_manager/core/session_manager.h
diff --git a/components/session_manager/core/session_manager.h b/components/session_manager/core/session_manager.h
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+// Copyright 2014 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 COMPONENTS_SESSION_MANAGER_CORE_SESSION_MANAGER_H_
+#define COMPONENTS_SESSION_MANAGER_CORE_SESSION_MANAGER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "components/session_manager/session_manager_export.h"
+
+namespace session_manager {
+
+class SessionManagerDelegate;
+
+// TODO(nkostylev): Get rid/consolidate with:
+// ash::SessionStateDelegate::SessionState and chromeos::LoggedInState.
+enum SESSION_EXPORT SessionState {
+  // Default value, when session state hasn't been initialized yet.
+  SESSION_STATE_UNKNOWN = 0,
+
+  // Running out of box UI.
+  SESSION_STATE_OOBE,
+
+  // Running login UI (primary user) but user sign in hasn't completed yet.
+  SESSION_STATE_LOGIN_PRIMARY,
+
+  // Running login UI (primary or secondary user), user sign in has been
+  // completed but login UI hasn't been hidden yet. This means that either
+  // some session initialization is happening or user has to go through some
+  // UI flow on the same login UI like select avatar, agree to terms of
+  // service etc.
+  SESSION_STATE_LOGGED_IN_NOT_ACTIVE,
+
+  // A user(s) has logged in *and* login UI is hidden i.e. user session is
+  // not blocked.
+  SESSION_STATE_ACTIVE,
+
+  // Same as SESSION_STATE_LOGIN_PRIMARY but for multi-profiles sign in i.e.
+  // when there's at least one user already active in the session.
+  SESSION_STATE_LOGIN_SECONDARY,
+};
+
+class SESSION_EXPORT SessionManager {
+ public:
+  SessionManager();
+  virtual ~SessionManager();
+
+  SessionState session_state() const { return session_state_; }
+  virtual void SetSessionState(SessionState state);
+
+  // Let session delegate executed on its plan of actions depending on the
+  // current session type / state.
+  void Start();
+
+ protected:
+  // Initializes SessionManager with delegate.
+  void Initialize(SessionManagerDelegate* delegate);
+
+ private:
+  SessionState session_state_;
+  scoped_ptr<SessionManagerDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionManager);
+};
+
+class SESSION_EXPORT SessionManagerDelegate {
+ public:
+  SessionManagerDelegate();
+  virtual ~SessionManagerDelegate();
+
+  virtual void SetSessionManager(
+      session_manager::SessionManager* session_manager);
+
+  // Executes specific actions defined by this delegate.
+  virtual void Start() = 0;
+
+ protected:
+  session_manager::SessionManager* session_manager_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SessionManagerDelegate);
+};
+
+}  // namespace session_manager
+
+#endif  // COMPONENTS_SESSION_MANAGER_CORE_SESSION_MANAGER_H_