java/com/android/incallui/video/impl/res/drawable/videocall_video_button_background.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
  android:color="@color/incall_button_ripple">
  <item android:id="@android:id/mask">
    <inset android:inset="5dp">
      <shape android:shape="oval">
        <solid android:color="@android:color/white"/>
      </shape>
    </inset>
  </item>
  <item>
    <selector>
      <item
        android:drawable="@drawable/video_button_bg_checked_pressed"
        android:state_checked="true"
        android:state_pressed="true"/>
      <item
        android:drawable="@drawable/video_button_bg_checked"
        android:state_checked="true"/>
      <item
        android:drawable="@drawable/video_button_bg_pressed"
        android:state_pressed="true"/>
      <item
        android:drawable="@drawable/video_button_bg_default"/>
    </selector>
  </item>
</ripple>