Checkpointing some Sync Attachment work. Added SyncAttachment and SyncAttachmentId.

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"
@@ skipping 42 matching lines @@
 class PasswordSpecifics;
 class PasswordSpecificsData;
 class PreferenceSpecifics;
 class PriorityPreferenceSpecifics;
 class SearchEngineSpecifics;
 class SessionHeader;
 class SessionSpecifics;
 class SessionTab;
 class SessionWindow;
 class SimpleCollapsedLayout;
+class SyncAttachmentId;
 class SyncCycleCompletedEventInfo;
 class SyncedNotification;
 class SyncedNotificationAction;
 class SyncedNotificationDestination;
 class SyncedNotificationImage;
 class SyncedNotificationProfileImage;
 class SyncedNotificationRenderInfo;
 class SyncedNotificationSpecifics;
 class TabNavigation;
 class Target;
@@ skipping 209 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* SyncAttachmentIdToValue(
+    const sync_pb::SyncAttachmentId& proto);
+
 }  // namespace syncer
 
 #endif  // SYNC_PROTOCOL_PROTO_VALUE_CONVERSIONS_H_