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

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2021 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:alpha="@dimen/text_highlight_alpha" android:color="?attr/colorPrimary" />
</selector>