[cros] Define session_manager component with SessionManager base class

chrome/browser/chromeos/login/session/login_oobe_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/login_oobe_session_manager_delegate.h"
+
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/browser_process_platform_part_chromeos.h"
+#include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h"
+#include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
+#include "chrome/browser/chromeos/login/login_wizard.h"
+#include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
+#include "chrome/common/pref_names.h"
+
+namespace chromeos {
+
+LoginOobeSessionManagerDelegate::LoginOobeSessionManagerDelegate() {
+}
+
+LoginOobeSessionManagerDelegate::~LoginOobeSessionManagerDelegate() {
+}
+
+void LoginOobeSessionManagerDelegate::Start() {
+  // State will be defined once out-of-box/login branching is complete.
+  ShowLoginWizard(std::string());
+
+  if (KioskModeSettings::Get()->IsKioskModeEnabled())
+    InitializeKioskModeScreensaver();
+
+  // Reset reboot after update flag when login screen is shown.
+  policy::BrowserPolicyConnectorChromeOS* connector =
+      g_browser_process->platform_part()->browser_policy_connector_chromeos();
+  if (!connector->IsEnterpriseManaged()) {
+    PrefService* local_state = g_browser_process->local_state();
+    local_state->ClearPref(prefs::kRebootAfterUpdate);
+  }
+}
+
+}  // namespace chromeos