[cros] Define session_manager component with SessionManager base class

chrome/browser/chromeos/login/session/kiosk_auto_launcher_session_manager_delegate.cc

+// 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.
+
+#include "chrome/browser/chromeos/login/session/kiosk_auto_launcher_session_manager_delegate.h"
+
+#include "base/logging.h"
+#include "chrome/browser/chromeos/login/login_wizard.h"
+#include "chrome/browser/chromeos/login/wizard_controller.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/session_manager_client.h"
+
+namespace chromeos {
+
+KioskAutoLauncherSessionManagerDelegate::
+    KioskAutoLauncherSessionManagerDelegate() {
+}
+
+KioskAutoLauncherSessionManagerDelegate::
+    ~KioskAutoLauncherSessionManagerDelegate() {
+}
+
+void KioskAutoLauncherSessionManagerDelegate::Start() {
+  // Kiosk app launcher starts with login state.
+  session_manager_->SetSessionState(
+      session_manager::SESSION_STATE_LOGIN_PRIMARY);
+
+  ShowLoginWizard(chromeos::WizardController::kAppLaunchSplashScreenName);
+
+  // Login screen is skipped but 'login-prompt-visible' signal is still needed.
+  VLOG(1) << "Kiosk app auto launch >> login-prompt-visible";
+  DBusThreadManager::Get()->GetSessionManagerClient()->EmitLoginPromptVisible();
+}
+
+}  // namespace chromeos