res/drawable/accessibility_qs_tooltip_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2022 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

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     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
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-->

<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:top="8dp">
        <shape
            android:shape="rectangle">
            <solid android:color="@*android:color/accent_primary_device_default"/>
            <corners android:radius="28dp" />
            <padding android:top="8dp" />
        </shape>
    </item>

    <item
        android:width="12dp"
        android:height="12dp"
        android:gravity="top|center_horizontal"
        android:top="-6dp">
        <rotate android:fromDegrees="45">
            <shape android:shape="rectangle">
            <solid android:color="@*android:color/accent_primary_device_default"/>
            </shape>
        </rotate>
    </item>
</layer-list>