[Sync] Enable adding notifier observers from ProfileSyncService

sync/notifier/object_id_payload_map.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 "sync/notifier/object_id_payload_map.h"
 
 namespace syncer {
 
+ObjectIdSet ObjectIdPayloadMapToSet(
+    const ObjectIdPayloadMap& id_payloads) {
+  ObjectIdSet ids;
+  for (ObjectIdPayloadMap::const_iterator it = id_payloads.begin();
+       it != id_payloads.end(); ++it) {
+    ids.insert(it->first);
+  }
+  return ids;
+}
+
+ObjectIdPayloadMap ObjectIdSetToPayloadMap(
+    ObjectIdSet ids, const std::string& payload) {

[msw, 2012/08/03 05:14:21]

One param per line

+  ObjectIdPayloadMap id_payloads;
+  for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {

[msw, 2012/08/03 05:14:21]

nit: remove unnecessary {}

+    id_payloads[*it] = payload;
+  }
+  return id_payloads;
+}
+
 ModelTypePayloadMap ObjectIdPayloadMapToModelTypePayloadMap(
     const ObjectIdPayloadMap& id_payloads) {
   ModelTypePayloadMap types_with_payloads;
   for (ObjectIdPayloadMap::const_iterator it = id_payloads.begin();
        it != id_payloads.end(); ++it) {
     ModelType model_type;
     if (!ObjectIdToRealModelType(it->first, &model_type)) {
       DLOG(WARNING) << "Invalid object ID: "
                     << ObjectIdToString(it->first);
       continue;
@@ skipping 12 matching lines @@
     if (!RealModelTypeToObjectId(it->first, &id)) {
       DLOG(WARNING) << "Invalid model type " << it->first;
       continue;
     }
     id_payloads[id] = it->second;
   }
   return id_payloads;
 }
 
 }  // namespace syncer