If customization includes default wallpaper, download and apply it.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.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/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 430 matching lines @@
     builder->Add("demoLoginMessage", IDS_KIOSK_MODE_LOGIN_MESSAGE);
 
   builder->Add("runType", CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kFirstExecAfterBoot) ?  "firstExecAfterBoot" :
                                         "notFirstExecAfterBoot");
 }
 
 void SigninScreenHandler::Show(const LoginScreenContext& context) {
   CHECK(delegate_);
 
+  // Restart fetch if previous attempt failed.
+  ServicesCustomizationDocument::GetInstance()->StartFetching();
+
   // Just initialize internal fields from context and call ShowImpl().
   oobe_ui_ = context.oobe_ui();
   if (!context.email().empty())
     email_ = context.email();
   else
     email_.clear();
   ShowImpl();
 }
 
 void SigninScreenHandler::ShowRetailModeLoginSpinner() {
@@ skipping 1307 matching lines @@
   DCHECK(gaia_screen_handler_);
   return gaia_screen_handler_->frame_state();
 }
 
 net::Error SigninScreenHandler::FrameError() const {
   DCHECK(gaia_screen_handler_);
   return gaia_screen_handler_->frame_error();
 }
 
 }  // namespace chromeos