[Sync] Move //sync to //components/sync.

sync/api/metadata_batch.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_METADATA_BATCH_H_
-#define SYNC_API_METADATA_BATCH_H_
-
-#include <map>
-#include <string>
-
-#include "sync/base/sync_export.h"
-#include "sync/protocol/data_type_state.pb.h"
-#include "sync/protocol/entity_metadata.pb.h"
-
-namespace syncer_v2 {
-
-// Map of client tag to EntityMetadata proto.
-typedef std::map<std::string, sync_pb::EntityMetadata> EntityMetadataMap;
-
-// Container used to pass sync metadata from services to their processor.
-class SYNC_EXPORT MetadataBatch {
- public:
-  MetadataBatch();
-  virtual ~MetadataBatch();
-
-  // Allows the caller to take ownership of the entire metadata map. This is
-  // done because the caller will probably swap out all the EntityMetadata
-  // protos from the map for performance reasons.
-  EntityMetadataMap&& TakeAllMetadata();
-
-  // Add |metadata| for |client_tag| to the batch.
-  void AddMetadata(const std::string& client_tag,
-                   const sync_pb::EntityMetadata& metadata);
-
-  // Get the DataTypeState for this batch.
-  const sync_pb::DataTypeState& GetDataTypeState() const;
-
-  // Set the DataTypeState for this batch.
-  void SetDataTypeState(const sync_pb::DataTypeState& state);
-
- private:
-  EntityMetadataMap metadata_map_;
-  sync_pb::DataTypeState state_;
-};
-
-}  // namespace syncer_v2
-
-#endif  // SYNC_API_METADATA_BATCH_H_