Add callback list to PrefModelAssociator after sync data is loaded

components/syncable_prefs/pref_service_syncable.cc

 // 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.
 
 #include "components/syncable_prefs/pref_service_syncable.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 135 matching lines @@
   priority_pref_sync_associator_.AddSyncedPrefObserver(name, observer);
 }
 
 void PrefServiceSyncable::RemoveSyncedPrefObserver(
     const std::string& name,
     SyncedPrefObserver* observer) {
   pref_sync_associator_.RemoveSyncedPrefObserver(name, observer);
   priority_pref_sync_associator_.RemoveSyncedPrefObserver(name, observer);
 }
 
+void PrefServiceSyncable::RegisterMergeDataFinishedCallback(
+    const base::Closure& callback) {
+  pref_sync_associator_.RegisterMergeDataFinishedCallback(callback);
+}
+
 // Set the PrefModelAssociatorClient to use for that object during tests.
 void PrefServiceSyncable::SetPrefModelAssociatorClientForTesting(
     const PrefModelAssociatorClient* pref_model_associator_client) {
   pref_sync_associator_.SetPrefModelAssociatorClientForTesting(
       pref_model_associator_client);
   priority_pref_sync_associator_.SetPrefModelAssociatorClientForTesting(
       pref_model_associator_client);
 }
 
 void PrefServiceSyncable::AddRegisteredSyncablePreference(
@@ skipping 11 matching lines @@
   FOR_EACH_OBSERVER(PrefServiceSyncableObserver, observer_list_,
                     OnIsSyncingChanged());
 }
 
 void PrefServiceSyncable::ProcessPrefChange(const std::string& name) {
   pref_sync_associator_.ProcessPrefChange(name);
   priority_pref_sync_associator_.ProcessPrefChange(name);
 }
 
 }  // namespace syncable_prefs