If customization includes default wallpaper, download and apply it.

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
@@ skipping 160 matching lines @@
         'browser/chromeos/charger_replace/charger_link_dialog.cc',
         'browser/chromeos/charger_replace/charger_link_dialog.h',
         'browser/chromeos/charger_replace/charger_replacement_dialog.cc',
         'browser/chromeos/charger_replace/charger_replacement_dialog.h',
         'browser/chromeos/choose_mobile_network_dialog.cc',
         'browser/chromeos/choose_mobile_network_dialog.h',
         'browser/chromeos/chrome_browser_main_chromeos.cc',
         'browser/chromeos/chrome_browser_main_chromeos.h',
         'browser/chromeos/customization_document.cc',
         'browser/chromeos/customization_document.h',
+        'browser/chromeos/customization_wallpaper_downloader.cc',
+        'browser/chromeos/customization_wallpaper_downloader.h',
         'browser/chromeos/display/display_configuration_observer.cc',
         'browser/chromeos/display/display_configuration_observer.h',
         'browser/chromeos/display/display_preferences.cc',
         'browser/chromeos/display/display_preferences.h',
         'browser/chromeos/display/overscan_calibrator.cc',
         'browser/chromeos/display/overscan_calibrator.h',
         'browser/chromeos/dbus/cros_dbus_service.cc',
         'browser/chromeos/dbus/cros_dbus_service.h',
         'browser/chromeos/dbus/display_power_service_provider.cc',
         'browser/chromeos/dbus/display_power_service_provider.h',
@@ skipping 847 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }