[Sync] Enable adding notifier observers from ProfileSyncService

sync/notifier/object_id_payload_map.h

 // 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.
 
 #ifndef SYNC_NOTIFIER_OBJECT_ID_PAYLOAD_MAP_H_
 #define SYNC_NOTIFIER_OBJECT_ID_PAYLOAD_MAP_H_
 
 #include <map>
 #include <string>
 
 #include "google/cacheinvalidation/include/types.h"
 #include "sync/internal_api/public/base/model_type_payload_map.h"
 #include "sync/notifier/invalidation_util.h"
 
 namespace syncer {
 
 typedef std::map<invalidation::ObjectId,
                  std::string,
                  ObjectIdLessThan> ObjectIdPayloadMap;
 
+// Converts between ObjectIdPayloadMaps and ObjectIdSets.
+ObjectIdSet ObjectIdPayloadMapToSet(const ObjectIdPayloadMap& id_payloads);
+ObjectIdPayloadMap ObjectIdSetToPayloadMap(
+    ObjectIdSet ids, const std::string& payload);

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

One param per line.

+
 // Converts between ObjectIdPayloadMaps and ModelTypePayloadMaps.
 ModelTypePayloadMap ObjectIdPayloadMapToModelTypePayloadMap(
     const ObjectIdPayloadMap& id_payloads);
 ObjectIdPayloadMap ModelTypePayloadMapToObjectIdPayloadMap(
     const ModelTypePayloadMap& type_payloads);
 
 }  // namespace syncer
 
 #endif  // HOME_DCHENG_SRC_CHROMIUM_SRC_SYNC_NOTIFIER_OBJECT_ID_PAYLOAD_MAP_H_