Apply default wallpaper from customization manifest.

chrome/browser/chromeos/login/login_display_host_impl.cc

Index: chrome/browser/chromeos/login/login_display_host_impl.cc
diff --git a/chrome/browser/chromeos/login/login_display_host_impl.cc b/chrome/browser/chromeos/login/login_display_host_impl.cc
index 76d675d85cf5a1eb0cc0c727183a06a20a09bee6..4692b4e362147ef4033412202ef739837ebcad51 100644
--- a/chrome/browser/chromeos/login/login_display_host_impl.cc
+++ b/chrome/browser/chromeos/login/login_display_host_impl.cc
@@ -48,6 +48,7 @@
 #include "chrome/browser/chromeos/login/webui_login_view.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/chromeos/mobile_config.h"
+#include "chrome/browser/chromeos/net/delay_network_call.h"
 #include "chrome/browser/chromeos/policy/auto_enrollment_client.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
@@ -1186,6 +1187,13 @@ void ShowLoginWizard(const std::string& first_screen_name) {
     return;
   }
 
+  if (StartupUtils::IsEulaAccepted()) {
+    DelayNetworkCall(
+        ServicesCustomizationDocument::GetInstance()
+            ->EnsureCustomizationAppliedClosure(),
+        base::TimeDelta::FromMilliseconds(kDefaultNetworkRetryDelayMS));
+  }
+
   bool show_login_screen =
       (first_screen_name.empty() && oobe_complete) ||
       first_screen_name == chromeos::WizardController::kLoginScreenName;