[Sync] USS: Add EntityChange.

sync/api/model_type_service.h

 // Copyright 2015 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_API_MODEL_TYPE_SERVICE_H_
 #define SYNC_API_MODEL_TYPE_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "sync/api/entity_change.h"
 #include "sync/api/entity_data.h"
 #include "sync/api/model_type_change_processor.h"
 #include "sync/base/sync_export.h"
 
 namespace syncer {
 class SyncError;
 }  // namespace syncer
 
 namespace syncer_v2 {
 
@@ skipping 22 matching lines @@
 
   // Perform the initial merge of data from the sync server. Should only need
   // to be called when sync is first turned on, not on every restart.
   virtual syncer::SyncError MergeSyncData(MetadataChanges* metadata_changes,
                                           EntityDataList entity_data_list) = 0;
 
   // Apply changes from the sync server locally.
   // TODO(skym): The change type should be in here somehow.
   virtual syncer::SyncError ApplySyncChanges(
       MetadataChanges* metadata_changes,
-      EntityDataList entity_data_list) = 0;
+      EntityChangeList entity_changes) = 0;
 
   // Asynchronously retrieve the sync metadata.
   virtual void LoadMetadata(MetadataCallback callback) = 0;
 
   // Asynchronously retrieve the corresponding sync data for |client_keys|.
   virtual void GetData(ClientKeyList client_keys, DataCallback callback) = 0;
 
   // Asynchronously retrieve all of the local sync data.
   virtual void GetAllData(DataCallback callback) = 0;
 
   // Get or generate a client tag for |entity_data|.
   virtual std::string GetClientTag(const EntityData* entity_data) = 0;
 
   // TODO(skym): See crbug/547087, do we need all these accessors?
   syncer_v2::ModelTypeChangeProcessor* change_processor();
 
   void set_change_processor(
       scoped_ptr<syncer_v2::ModelTypeChangeProcessor> change_processor);
 
   void clear_change_processor();
 
  private:
   // Recieves ownership in set_change_processor(...).
   scoped_ptr<syncer_v2::ModelTypeChangeProcessor> change_processor_;
 };
 
 }  // namespace syncer_v2
 
 #endif  // SYNC_API_MODEL_TYPE_SERVICE_H_