chromium/chrome/browser/language/android/java/res/menu/languages_action_bar_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2017 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" >
    
    <item
        android:id="@+id/search"
        android:title="@string/search"
        app:showAsAction="always"
        app:actionViewClass="androidx.appcompat.widget.SearchView"/>
</menu>