init: Update boot-complete to run at login-prompt-visible.

boot-complete.conf

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# boot-complete
-#
-# Processing required during boot after login prompt is displayed.
-# Primarily, this means calculating boot time statistics.
+description   "Send boot stats after login prompt is visible"
+author        "chromium-os-dev@chromium.org"
 
+# This script is primarily responsible for sending boot time statistics
+# after we finish booting.  Note that many other jobs also start on
+# "stopped boot-complete", though.
 
 # Note, this line is modified by chromeos-factoryinstall.ebuild
 # and mod_for_factory. Please do not change without also changing
 # those references.
-start on login-prompt-ready
+start on login-prompt-visible
 
 task
 
 script
-  # The login-prompt-ready signal is emitted every time the login
-  # screen is displayed so the check below makes sure boot stats are
-  # generated only once per boot.
-  if [ -n "$(bootstat_last login-prompt-ready)" ]; then
+  # The login-prompt-visible signal is emitted every time the login
+  # screen is displayed.  The check below makes sure boot stats are
+  # reported only once per boot.
+  if [ -n "$(bootstat_get_last boot-complete)" ]; then
     exit 0
   fi
 
-  bootstat login-prompt-ready
+  bootstat boot-complete
 
   # If ureadahead is still running, then presumably it's performing
   # a boot trace.  We only care about tracing until login prompt, so
   # stop the process now.
   #
   # We have to ignore the return status in case ureadahead has
   # already completed, because pkill helpfully exits with a non-zero
   # status when no process was found.
   pkill '^ureadahead$' || true
 
   # Report boot time and disk usage metrics to UMA.
   send_boot_metrics &
 end script