chromium/chrome/browser/download/internal/android/java/res/drawable/infobar_download_complete_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2018 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:aapt="http://schemas.android.com/aapt"
    tools:targetApi="21"
    android:drawable="@drawable/infobar_download_complete">

    <target android:name="circle">
        <aapt:attr name="android:animation">
            <set android:ordering="sequentially">
                <objectAnimator
                    android:duration="100"
                    android:interpolator="@android:interpolator/linear"
                    android:propertyName="fillAlpha"
                    android:valueFrom="0"
                    android:valueTo="1"/>
                <objectAnimator
                    android:duration="500"
                    android:startOffset="300"
                    android:interpolator="@android:interpolator/linear"
                    android:propertyName="fillAlpha"
                    android:valueFrom="1"
                    android:valueTo="0"/>
            </set>
        </aapt:attr>
    </target>
</animated-vector>