/var/lib/lxc/android/pre-start.d/50-micshm is in lxc-android-config 0.230+16.04.20160328-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #! /bin/sh
mkfifo -m 0660 /dev/socket/micshm || true
chown 1013 /dev/socket/micshm || true
chgrp android_media /dev/socket/micshm || true
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