[Sync] Add support for loading, updating and querying delete journals in

sync/syncable/write_transaction.cc

Index: sync/syncable/write_transaction.cc
diff --git a/sync/syncable/write_transaction.cc b/sync/syncable/write_transaction.cc
index bbd9dc410e65d83aeece581a68a252642276dcdc..b9e646320de3313d95ecc77e56bb764f575f5994 100644
--- a/sync/syncable/write_transaction.cc
+++ b/sync/syncable/write_transaction.cc
@@ -170,6 +170,7 @@ std::string WriterTagToString(WriterTag writer_tag) {
     ENUM_CASE(AUTHWATCHER);
     ENUM_CASE(UNITTEST);
     ENUM_CASE(VACUUM_AFTER_SAVE);
+    ENUM_CASE(HANDLE_SAVE_FAILURE);
     ENUM_CASE(PURGE_ENTRIES);
     ENUM_CASE(SYNCAPI);
   };