This file is indexed.

/etc/X11/Xsession.d/55gnome-session_gnomerc is in gnome-session-common 3.18.1.2-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# If we are running the GNOME session, source ~/.gnomerc

BASESTARTUP=${STARTUP%% *}
BASESTARTUP=${BASESTARTUP##*/}
if [ "$BASESTARTUP" = x-session-manager ]; then
    BASESTARTUP=$(basename $(readlink /etc/alternatives/x-session-manager))
fi
case "$BASESTARTUP" in
  gnome-session*)
    GNOMERC=$HOME/.gnomerc
    if [ -r "$GNOMERC" ]; then
      . "$GNOMERC"
    fi
    # We prepend /usr/share/gnome since its defaults.list actually points 
    # to /etc so it is configurable.
    if [ -z "$XDG_DATA_DIRS" ]; then
      XDG_DATA_DIRS=/usr/share/gnome:/usr/local/share/:/usr/share/
    else
      XDG_DATA_DIRS=/usr/share/gnome:"$XDG_DATA_DIRS"
    fi
    export XDG_DATA_DIRS
    ;;
esac