Add avatar syncing for supervised users.

chrome/browser/managed_mode/managed_user_service.cc

Index: chrome/browser/managed_mode/managed_user_service.cc
diff --git a/chrome/browser/managed_mode/managed_user_service.cc b/chrome/browser/managed_mode/managed_user_service.cc
index c1907d5f1faaa2827f4692fd89e02b991081fa64..bf58cbbf96c991400e433f47722a6997a26dd10a 100644
--- a/chrome/browser/managed_mode/managed_user_service.cc
+++ b/chrome/browser/managed_mode/managed_user_service.cc
@@ -21,6 +21,8 @@
 #include "chrome/browser/managed_mode/managed_user_settings_service_factory.h"
 #include "chrome/browser/managed_mode/managed_user_sync_service.h"
 #include "chrome/browser/managed_mode/managed_user_sync_service_factory.h"
+#include "chrome/browser/managed_mode/supervised_user_pref_mapping_service.h"
+#include "chrome/browser/managed_mode/supervised_user_pref_mapping_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -533,6 +535,9 @@ void ManagedUserService::Init() {
 
   settings_service->Activate();
 
+  SupervisedUserPrefMappingServiceFactory::GetForBrowserContext(profile_)
+      ->Init();
+
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kManagedUserSyncToken)) {
     InitSync(