/usr/share/ubuntu-touch-session/usc-wrapper is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
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 6 7 8 | #!/bin/sh
# We need to grab ANDROID_ROOT from /etc/environment, because Mir uses
# it to find input configuration files and autopilot won't work without that.
. /etc/environment
export ANDROID_ROOT
exec unity-system-compositor --disable-overlays=false --spinner=/usr/bin/unity-system-compositor-spinner $@
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