chrome/android/java/res/drawable-v21/transition_expand_more_expand_less_black_24dp.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 The Chromium Authors. All rights reserved.
     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">

    <aapt:attr name="android:drawable">
        <vector
            android:width="24dp"
            android:height="24dp"
            android:viewportHeight="24"
            android:viewportWidth="24">

            <path
                android:name="arrow"
                android:fillColor="#000000"
                android:pathData="M12,8L6,14L7.41,15.41L12,10.83L16.59,15.41L18,14z"/>
        </vector>
    </aapt:attr>

    <target android:name="arrow">
        <aapt:attr name="android:animation">
            <objectAnimator
                android:duration="250"
                android:propertyName="pathData"
                android:valueFrom="M12,13.17L7.41,8.59L6,10L12,16L18,10L16.59,8.59z"
                android:valueTo="M12,8L6,14L7.41,15.41L12,10.83L16.59,15.41L18,14z"
                android:valueType="pathType"/>
        </aapt:attr>
    </target>
</animated-vector>