Initial translation event proto.

components/sync/protocol/proto_visitors.h

Index: components/sync/protocol/proto_visitors.h
diff --git a/components/sync/protocol/proto_visitors.h b/components/sync/protocol/proto_visitors.h
index e035e0584b9471b3cc90a97bed84faac9be8ff69..08575749cce9ae0ef76f92a252bdbb0f18cc710f 100644
--- a/components/sync/protocol/proto_visitors.h
+++ b/components/sync/protocol/proto_visitors.h
@@ -847,6 +847,12 @@ VISIT_PROTO_FIELDS(const sync_pb::TimeRangeDirective& proto) {
   VISIT(end_time_usec);
 }
 
+VISIT_PROTO_FIELDS(const sync_pb::Translation& proto) {
+  VISIT(from_language_code);
+  VISIT(to_language_code);
+  VISIT_ENUM(interaction);
+}
+
 VISIT_PROTO_FIELDS(const sync_pb::TypeHint& proto) {
   VISIT(data_type_id);
   VISIT(has_valid_hint);
@@ -873,6 +879,7 @@ VISIT_PROTO_FIELDS(const sync_pb::UserEventSpecifics& proto) {
   VISIT(session_id);
   VISIT(field_trial_event);
   VISIT(language_detection);
+  VISIT(translation);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::WalletMaskedCreditCard& proto) {