ui/android/java/res/anim/menu_enter_fade.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2025 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false">
    <alpha android:interpolator="@anim/emphasized"
        android:fromAlpha="0"
        android:toAlpha="1"
        android:duration="250" />
</set>