Add field to monitor last visited time for each search engine

components/sync/protocol/proto_visitors.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_SYNC_PROTOCOL_PROTO_VISITORS_H_
 #define COMPONENTS_SYNC_PROTOCOL_PROTO_VISITORS_H_
 
 #include "components/sync/protocol/app_list_specifics.pb.h"
 #include "components/sync/protocol/app_notification_specifics.pb.h"
 #include "components/sync/protocol/app_setting_specifics.pb.h"
@@ skipping 500 matching lines @@
   VISIT(last_modified);
   VISIT(sync_guid);
   VISIT_REP(alternate_urls);
   VISIT(search_terms_replacement_key);
   VISIT(image_url);
   VISIT(search_url_post_params);
   VISIT(suggestions_url_post_params);
   VISIT(instant_url_post_params);
   VISIT(image_url_post_params);
   VISIT(new_tab_url);
+  VISIT(last_visited);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::SessionSpecifics& proto) {
   VISIT(session_tag);
   VISIT(header);
   VISIT(tab);
   VISIT(tab_node_id);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::ThemeSpecifics& proto) {
@@ skipping 292 matching lines @@
 
 }  // namespace syncer
 
 #undef VISIT_
 #undef VISIT_BYTES
 #undef VISIT_ENUM
 #undef VISIT
 #undef VISIT_REP
 
 #endif  // COMPONENTS_SYNC_PROTOCOL_PROTO_VISITORS_H_