Enable user change background image in settings page in Aura build.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 18 matching lines @@
 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h"
 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h"
 #include "chrome/browser/chromeos/login/authenticator.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
 #include "chrome/browser/chromeos/login/ownership_service.h"
 #include "chrome/browser/chromeos/login/screen_locker.h"
 #include "chrome/browser/chromeos/login/session_manager_observer.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/net/cros_network_change_notifier_factory.h"
 #include "chrome/browser/chromeos/net/network_change_notifier_chromeos.h"
+#include "chrome/browser/chromeos/options2/desktop_background_observer.h"
 #include "chrome/browser/chromeos/power/brightness_observer.h"
 #include "chrome/browser/chromeos/power/resume_observer.h"
 #include "chrome/browser/chromeos/power/screen_lock_observer.h"
 #include "chrome/browser/chromeos/status/status_area_view_chromeos.h"
 #include "chrome/browser/chromeos/system/runtime_environment.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"
@@ skipping 434 matching lines @@
   // been called.
   // TODO(vlaviano): Move this back to PostMainMessageLoopStart when we remove
   // the --enable-bluetooth flag.
   if (parsed_command_line().HasSwitch(switches::kEnableBluetooth)) {
     chromeos::BluetoothManager::Initialize();
   }
 
 #if defined(USE_AURA)
   // These are dependent on the ash::Shell singleton already having been
   // initialized.
+  desktop_background_observer_.reset(new chromeos::DesktopBackgroundObserver);
   power_button_observer_.reset(new chromeos::PowerButtonObserver);
   video_property_writer_.reset(new chromeos::VideoPropertyWriter);
 #endif
 
   ChromeBrowserMainPartsLinux::PostBrowserStart();
 }
 
 // Shut down services before the browser process, etc are destroyed.
 void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("UIMessageLoopEnded",
@@ skipping 45 matching lines @@
   // Let VideoPropertyWriter unregister itself as an observer of the ash::Shell
   // singleton before the shell is destroyed.
   video_property_writer_.reset();
   // Remove PowerButtonObserver attached to a D-Bus client before
   // DBusThreadManager is shut down.
   power_button_observer_.reset();
 #endif
 
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 }