lawnchair/res/drawable/ic_bubble_button.xml

<?xml version="1.0" encoding="utf-8"?>
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  ~ 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
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  ~      http://www.apache.org/licenses/LICENSE-2.0
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="960"
    android:viewportHeight="960">
  <path
      android:pathData="m464,480 l-90,-90q-11,-11 -11.5,-27.5T374,334q11,-11 28,-11t28,11l90,89v-49q0,-17 11.5,-28.5T560,334q17,0 28.5,11.5T600,374v146q0,17 -11.5,28.5T560,560L414,560q-17,0 -28.5,-11.5T374,520q0,-17 11.5,-28.5T414,480h50ZM760,800q-50,0 -85,-35t-35,-85q0,-50 35,-85t85,-35q50,0 85,35t35,85q0,50 -35,85t-85,35ZM160,800q-33,0 -56.5,-23.5T80,720v-480q0,-33 23.5,-56.5T160,160h640q33,0 56.5,23.5T880,240v200q0,17 -11.5,28.5T840,480q-17,0 -28.5,-11.5T800,440v-200L160,240v480h360q17,0 28.5,11.5T560,760q0,17 -11.5,28.5T520,800L160,800Z"
      android:fillColor="#FF000000"/>
</vector>