[sync] Add WalletMetadataSpecifics protobuf.

sync/protocol/proto_enum_conversions.h

 // Copyright 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_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_
 #define SYNC_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_
 
 // Keep this file in sync with the .proto files in this directory.
 
 #include "sync/base/sync_export.h"
@@ skipping 41 matching lines @@
 
 SYNC_EXPORT_PRIVATE const char* GetActionString(
     sync_pb::SyncEnums::Action action);
 
 SYNC_EXPORT_PRIVATE const char* GetLaunchTypeString(
     sync_pb::AppSpecifics::LaunchType launch_type);
 
 SYNC_EXPORT_PRIVATE const char* GetWalletInfoTypeString(
     sync_pb::AutofillWalletSpecifics::WalletInfoType wallet_info_type);
 
+SYNC_EXPORT_PRIVATE const char* GetWalletMetadataTypeString(
+    sync_pb::WalletMetadataSpecifics::Type wallet_metadata_type);
+
 SYNC_EXPORT_PRIVATE const char* GetWalletCardStatusString(
     sync_pb::WalletMaskedCreditCard::WalletCardStatus wallet_card_status);
 
 SYNC_EXPORT_PRIVATE const char* GetWalletCardTypeString(
     sync_pb::WalletMaskedCreditCard::WalletCardType wallet_card_type);
 
 const char* GetDeviceTypeString(sync_pb::SyncEnums::DeviceType device_type);
 
 const char* GetFaviconTypeString(sync_pb::SessionTab::FaviconType favicon_type);
 
 const char* PassphraseTypeString(sync_pb::NigoriSpecifics::PassphraseType type);
 
 const char* SingletonDebugEventTypeString(
     sync_pb::SyncEnums::SingletonDebugEventType type);
 
 const char* GetBlockedStateString(sync_pb::TabNavigation::BlockedState state);
 
 }  // namespace syncer
 
 #endif  // SYNC_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_