Use helper DeviceChangeHandler to call mousecontrol/tpcontrol whenever a device is attached.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // Copyright (c) 2012 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_CHROME_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 #include "chrome/browser/chromeos/version_loader.h"
@@ skipping 27 matching lines @@
 namespace default_app_order {
 class ExternalLoader;
 }
 
 namespace internal {
 class DBusServices;
 }
 
 namespace system {
 class AutomaticRebootManager;
+class DeviceChangeHandler;
 }
 
 class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
  public:
   explicit ChromeBrowserMainPartsChromeos(
       const content::MainFunctionParams& parameters);
   virtual ~ChromeBrowserMainPartsChromeos();
 
   // ChromeBrowserMainParts overrides.
   virtual void PreEarlyInitialization() OVERRIDE;
@@ skipping 24 matching lines @@
   scoped_ptr<ScreenLockObserver> screen_lock_observer_;
   scoped_ptr<ScreensaverController> screensaver_controller_;
   scoped_ptr<PeripheralBatteryObserver> peripheral_battery_observer_;
   scoped_ptr<PowerButtonObserver> power_button_observer_;
   scoped_ptr<content::PowerSaveBlocker> retail_mode_power_save_blocker_;
   scoped_ptr<UserActivityNotifier> user_activity_notifier_;
   scoped_ptr<VideoActivityNotifier> video_activity_notifier_;
   scoped_ptr<StorageMonitorCros> storage_monitor_;
   scoped_ptr<system::AutomaticRebootManager> automatic_reboot_manager_;
   scoped_ptr<IdleActionWarningObserver> idle_action_warning_observer_;
+  scoped_ptr<system::DeviceChangeHandler> device_change_handler_;
 
   scoped_ptr<internal::DBusServices> dbus_services_;
 
   VersionLoader cros_version_loader_;
   CancelableTaskTracker tracker_;
   bool use_new_network_change_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_