[cros] Define session_manager component with SessionManager base class

chrome/browser/browser_process_platform_part_chromeos.h

 // Copyright (c) 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_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_
 #define CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/browser_process_platform_part_base.h"
 
+namespace base {
+class CommandLine;
+}
+
 namespace chromeos {
 class OomPriorityManager;
 class ProfileHelper;
 }
 
 namespace chromeos {
 namespace system {
 class AutomaticRebootManager;
 }
 }
 
 namespace policy {
 class BrowserPolicyConnector;
 class BrowserPolicyConnectorChromeOS;
 }
 
+namespace session_manager {
+class SessionManager;
+}
+
+class Profile;
+
 class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
                                    public base::NonThreadSafe {
  public:
   BrowserProcessPlatformPart();
   virtual ~BrowserProcessPlatformPart();
 
   void InitializeAutomaticRebootManager();
   void ShutdownAutomaticRebootManager();
 
+  void InitializeSessionManager(const base::CommandLine& parsed_command_line,
+                                Profile* profile,
+                                bool is_running_test);
+  void ShutdownSessionManager();
+
+  // Returns the SessionManager instance that is used to initialize and
+  // start user sessions as well as responsible on launching pre-session UI like
+  // out-of-box or login.
+  virtual session_manager::SessionManager* session_manager();
+
   // Returns the out-of-memory priority manager.
   // Virtual for testing (see TestingBrowserProcessPlatformPart).
   virtual chromeos::OomPriorityManager* oom_priority_manager();
 
   // Returns the ProfileHelper instance that is used to identify
   // users and their profiles in Chrome OS multi user session.
   chromeos::ProfileHelper* profile_helper();
 
   chromeos::system::AutomaticRebootManager* automatic_reboot_manager() {
     return automatic_reboot_manager_.get();
   }
 
   policy::BrowserPolicyConnectorChromeOS* browser_policy_connector_chromeos();
 
   // Overridden from BrowserProcessPlatformPartBase:
   virtual void StartTearDown() OVERRIDE;
 
   virtual scoped_ptr<policy::BrowserPolicyConnector>
       CreateBrowserPolicyConnector() OVERRIDE;
 
  private:
   void CreateProfileHelper();
 
+  scoped_ptr<session_manager::SessionManager> session_manager_;
+
   bool created_profile_helper_;
   scoped_ptr<chromeos::ProfileHelper> profile_helper_;
 
   scoped_ptr<chromeos::OomPriorityManager> oom_priority_manager_;
 
   scoped_ptr<chromeos::system::AutomaticRebootManager>
       automatic_reboot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessPlatformPart);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_