[cros] Define session_manager component with SessionManager base class

chrome/browser/chromeos/login/session/stub_login_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/stub_login_session_manager_delegate.h"
+
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+
+namespace chromeos {
+
+StubLoginSessionManagerDelegate::StubLoginSessionManagerDelegate(
+    Profile* profile,
+    const std::string& login_user_id)
+    : RestoreAfterCrashSessionManagerDelegate(profile, login_user_id) {
+}
+
+StubLoginSessionManagerDelegate::~StubLoginSessionManagerDelegate() {
+}
+
+void StubLoginSessionManagerDelegate::Start() {
+  session_manager_->SetSessionState(
+      session_manager::SessionManager::SESSION_STATE_ACTIVE);
+
+  // For dev machines and stub user emulate as if sync has been initialized.
+  profile()->GetPrefs()->SetString(prefs::kGoogleServicesUsername,
+                                   login_user_id());
+
+  RestoreAfterCrashSessionManagerDelegate::Start();
+}
+
+}  // namespace chromeos