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

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 55 matching lines @@
 #include "chrome/browser/chromeos/power/screen_lock_observer.h"
 #include "chrome/browser/chromeos/power/suspend_observer.h"
 #include "chrome/browser/chromeos/power/user_activity_notifier.h"
 #include "chrome/browser/chromeos/power/video_activity_notifier.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/screensaver/screensaver_controller.h"
 #include "chrome/browser/chromeos/settings/device_oauth2_token_service_factory.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #include "chrome/browser/chromeos/settings/owner_key_util.h"
 #include "chrome/browser/chromeos/system/automatic_reboot_manager.h"
+#include "chrome/browser/chromeos/system/device_change_handler.h"
 #include "chrome/browser/chromeos/system/statistics_provider.h"
 #include "chrome/browser/chromeos/system_key_event_listener.h"
 #include "chrome/browser/chromeos/upgrade_detector_chromeos.h"
 #include "chrome/browser/chromeos/web_socket_proxy_controller.h"
 #include "chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 628 matching lines @@
   display_configuration_observer_.reset(
       new DisplayConfigurationObserver());
 
   automatic_reboot_manager_.reset(new system::AutomaticRebootManager(
       scoped_ptr<base::TickClock>(new base::DefaultTickClock)));
 
   // This observer cannot be created earlier because it requires the shell to be
   // available.
   idle_action_warning_observer_.reset(new IdleActionWarningObserver());
 
+  // Listen to changes in device hierarchy.
+  device_change_handler_.reset(new system::DeviceChangeHandler());
+
   ChromeBrowserMainPartsLinux::PostProfileInit();
 }
 
 void ChromeBrowserMainPartsChromeos::PreBrowserStart() {
   // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun()
   // -- just before MetricsService::LogNeedForCleanShutdown().
 
   g_browser_process->metrics_service()->StartExternalMetrics();
 
   // Listen for XI_HierarchyChanged events. Note: if this is moved to
@@ skipping 173 matching lines @@
   trial->AppendGroup("4GB_RAM_4GB_swap", zram_group == '4' ? 1 : 0);
   trial->AppendGroup("4GB_RAM_6GB_swap", zram_group == '5' ? 1 : 0);
   trial->AppendGroup("snow_no_swap", zram_group == '6' ? 1 : 0);
   trial->AppendGroup("snow_1GB_swap", zram_group == '7' ? 1 : 0);
   trial->AppendGroup("snow_2GB_swap", zram_group == '8' ? 1 : 0);
   // This is necessary to start the experiment as a side effect.
   trial->group();
 }
 
 }  //  namespace chromeos