Update sync API to support attachments.

sync/protocol/proto_value_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.
 
 // Keep this file in sync with the .proto files in this directory.
 
 #ifndef SYNC_PROTOCOL_PROTO_VALUE_CONVERSIONS_H_
 #define SYNC_PROTOCOL_PROTO_VALUE_CONVERSIONS_H_
 
 #include "sync/base/sync_export.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace sync_pb {
 class AppListSpecifics;
 class AppNotification;
 class AppNotificationSettings;
 class AppSettingSpecifics;
 class AppSpecifics;
 class ArticleSpecifics;
+class AttachmentIdProto;
 class AutofillProfileSpecifics;
 class AutofillSpecifics;
 class BookmarkSpecifics;
 class ClientConfigParams;
 class ClientToServerMessage;
 class ClientToServerResponse;
 class CoalescedSyncedNotification;
 class CollapsedInfo;
 class DatatypeAssociationStats;
 class DebugEventInfo;
@@ skipping 256 matching lines @@
 
 base::DictionaryValue* DebugInfoToValue(
     const sync_pb::DebugInfo& proto);
 
 base::DictionaryValue* SyncCycleCompletedEventInfoToValue(
     const sync_pb::SyncCycleCompletedEventInfo& proto);
 
 base::DictionaryValue* ClientConfigParamsToValue(
     const sync_pb::ClientConfigParams& proto);
 
+SYNC_EXPORT_PRIVATE base::DictionaryValue* AttachmentIdProtoToValue(
+    const sync_pb::AttachmentIdProto& proto);
+
 }  // namespace syncer
 
 #endif  // SYNC_PROTOCOL_PROTO_VALUE_CONVERSIONS_H_