/etc/profile.d/add_custom_to_xdg_data.sh is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # For bug LP: #1413818, we need to unclude /custom/usr/share for customized
# notification sounds to work
export XDG_DATA_DIRS=$XDG_DATA_DIRS:"/custom/usr/share/"
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