sync: Implement NonBlockingTypeProcessorCore

sync/engine/non_blocking_sync_common.h

 // 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.
 
 #ifndef SYNC_ENGINE_NON_BLOCKING_SYNC_COMMON_H_
 #define SYNC_ENGINE_NON_BLOCKING_SYNC_COMMON_H_
 
 #include <string>
 #include <vector>
 
 #include "base/time/time.h"
 #include "sync/base/sync_export.h"
 #include "sync/protocol/sync.pb.h"
 
 namespace syncer {
 
+static const int64 kUncommittedVersion = -1;

[Nicolas Zea, 2014/05/28 23:56:15]

Any reason this was changed from 0 to -1?

[rlarocque, 2014/05/29 20:54:52]

-1 is what the current sync engine uses.

+
 // Data-type global state that must be accessed and updated on the sync thread,
 // but persisted on or through the model thread.
 struct SYNC_EXPORT_PRIVATE DataTypeState {
   DataTypeState();
   ~DataTypeState();
 
   // The latest progress markers received from the server.
   sync_pb::DataTypeProgressMarker progress_marker;
 
   // A data type context.  Sent to the server in every commit or update
@@ skipping 62 matching lines @@
   sync_pb::EntitySpecifics specifics;
 };
 
 typedef std::vector<CommitRequestData> CommitRequestDataList;
 typedef std::vector<CommitResponseData> CommitResponseDataList;
 typedef std::vector<UpdateResponseData> UpdateResponseDataList;
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_NON_BLOCKING_SYNC_COMMON_H_