Creating protobuf for reading list sync

components/sync/protocol/proto_value_conversions.h

Index: components/sync/protocol/proto_value_conversions.h
diff --git a/components/sync/protocol/proto_value_conversions.h b/components/sync/protocol/proto_value_conversions.h
index 64548daadb9fec6fb7c64aad6961ac1297215183..8147d1a8539d6feaf5459406c4143db6d0be78ad 100644
--- a/components/sync/protocol/proto_value_conversions.h
+++ b/components/sync/protocol/proto_value_conversions.h
@@ -62,6 +62,7 @@ class PreferenceSpecifics;
 class PriorityPreferenceSpecifics;
 class PrinterPPDData;
 class PrinterSpecifics;
+class ReadingListSpecifics;
 class SearchEngineSpecifics;
 class SessionHeader;
 class SessionSpecifics;
@@ -250,6 +251,10 @@ std::unique_ptr<base::DictionaryValue> PreferenceSpecificsToValue(
 std::unique_ptr<base::DictionaryValue> PrinterSpecificsToValue(
     const sync_pb::PrinterSpecifics& printer_specifics);
 
+// Sub-protocol of ReadingListSpecifics.
+std::unique_ptr<base::DictionaryValue> ReadingListSpecificsToValue(
+    const sync_pb::ReadingListSpecifics& proto);
+
 std::unique_ptr<base::DictionaryValue>
 SyncedNotificationAppInfoSpecificsToValue(
     const sync_pb::SyncedNotificationAppInfoSpecifics&