Comment 2 for bug 1507514

After this event unity does own the screen saver:

$ busctl --user status org.gnome.ScreenSaver
PID=3468
PPID=3206
TTY=n/a
UID=1000
EUID=1000
SUID=1000
FSUID=1000
OwnerUID=1000
GID=1000
EGID=1000
SGID=1000
FSGID=1000
SupplementaryGIDs=4 24 27 30 46 113 124 125 126 127 1000
Comm=compiz
Exe=/usr/bin/compiz
CommandLine=compiz
Label=unconfined
CGroup=/user.slice/user-1000.slice/session-c2.scope
Unit=session-c2.scope
Slice=user-1000.slice
UserUnit=n/a
UserSlice=-.slice
Session=c2
AuditLoginUID=n/a
AuditSessionID=n/a
UniqueName=:1.23
EffectiveCapabilities=
PermittedCapabilities=
InheritableCapabilities=
BoundingCapabilities=cap_chown cap_dac_override cap_dac_read_search
        cap_fowner cap_fsetid cap_kill cap_setgid
        cap_setuid cap_setpcap cap_linux_immutable cap_net_bind_service
        cap_net_broadcast cap_net_admin cap_net_raw cap_ipc_lock
        cap_ipc_owner cap_sys_module cap_sys_rawio cap_sys_chroot
        cap_sys_ptrace cap_sys_pacct cap_sys_admin cap_sys_boot
        cap_sys_nice cap_sys_resource cap_sys_time cap_sys_tty_config
        cap_mknod cap_lease cap_audit_write cap_audit_control
        cap_setfcap cap_mac_override cap_mac_admin cap_syslog
        cap_wake_alarm cap_block_suspend cap_audit_read