If customization includes default wallpaper, download and apply it.

chrome/common/pref_names.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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 716 matching lines @@
 extern const char kDeviceEnrollmentAutoStart[];
 extern const char kDeviceEnrollmentCanExit[];
 extern const char kUsersLRUInputMethod[];
 extern const char kEchoCheckedOffers[];
 extern const char kCachedMultiProfileUserBehavior[];
 extern const char kInitialLocale[];
 extern const char kOobeComplete[];
 extern const char kDeviceRegistered[];
 extern const char kUsedPolicyCertificates[];
 extern const char kServerBackedDeviceState[];
+extern const char kCustomizationDefaultWallpaperURL[];
 #endif
 
 extern const char kClearPluginLSODataEnabled[];
 extern const char kPepperFlashSettingsEnabled[];
 extern const char kDiskCacheDir[];
 extern const char kDiskCacheSize[];
 extern const char kMediaCacheSize[];
 
 extern const char kChromeOsReleaseChannel[];
 
@@ skipping 161 matching lines @@
 
 #if defined(OS_ANDROID)
 extern const char kPartnerBookmarkMappings[];
 #endif
 
 extern const char kQuickCheckEnabled[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_