sync: Add interfaces for per-type sync

sync/engine/get_updates_processor.cc

 // Copyright 2014 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/engine/get_updates_processor.h"
 
 #include <map>
 
 #include "sync/engine/get_updates_delegate.h"
-#include "sync/engine/sync_directory_update_handler.h"
+#include "sync/engine/update_handler.h"
 #include "sync/protocol/sync.pb.h"
 
+typedef std::vector<const sync_pb::SyncEntity*> SyncEntityList;
+typedef std::map<syncer::ModelType, SyncEntityList> TypeSyncEntityMap;
+
 namespace syncer {
 
 typedef std::map<ModelType, size_t> TypeToIndexMap;
 
 namespace {
 
 // Given a GetUpdates response, iterates over all the returned items and
 // divides them according to their type.  Outputs a map from model types to
 // received SyncEntities.  The output map will have entries (possibly empty)
 // for all types in |requested_types|.
@@ skipping 116 matching lines @@
 
   return true;
 }
 
 void GetUpdatesProcessor::ApplyUpdates(
     sessions::StatusController* status_controller) {
   delegate_.ApplyUpdates(status_controller, update_handler_map_);
 }
 
 }  // namespace syncer