chromium/components/browser_ui/styles/android/java/res/color/toolbar_button_highlight_color.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2023 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item
      android:state_hovered="true"
      android:alpha="0.08"
      android:color="?attr/colorOnSurface" />
  <item
      android:state_pressed="true"
      android:alpha="0.12"
      android:color="?attr/colorOnSurface" />
  <item
      android:color="@android:color/transparent" />
</selector>