cros: Explicitly manage app session lifetime.

chrome/browser/chromeos/app_mode/app_session_lifetime.h

+// Copyright 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 CHROME_BROWSER_CHROMEOS_APP_MODE_APP_SESSION_LIFETIME_H_
+#define CHROME_BROWSER_CHROMEOS_APP_MODE_APP_SESSION_LIFETIME_H_
+
+#include <string>
+
+class Profile;
+
+namespace chromeos {
+
+// Initializes an app session.
+void InitAppSession(Profile* profile, const std::string& app_id);
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_APP_SESSION_LIFETIME_H_