chromium/chrome/android/features/tab_ui/java/res/anim/iph_touch_point_background_alpha_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:ordering="sequentially">
    <objectAnimator
        android:propertyName="fillAlpha"
        android:duration="900"
        android:valueFrom="0"
        android:valueTo="0"/>
    <objectAnimator
        android:propertyName="fillAlpha"
        android:duration="400"
        android:valueFrom="0"
        android:valueTo="0.5"/>
    <!--Dummy animation to work as start offset.-->
    <objectAnimator
        android:propertyName="fillAlpha"
        android:duration="2350"
        android:valueFrom="0.5"
        android:valueTo="0.5"/>
    <objectAnimator
        android:propertyName="fillAlpha"
        android:duration="300"
        android:valueFrom="0.5"
        android:valueTo="0"/>
</set>