Log time in suspend.

src/platform/acpi/action_lid.sh

 #!/bin/sh
 
 # 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.
 
 logger "action_lid.sh: " `cat /proc/acpi/button/lid/*/state`
 
 grep -q "closed" /proc/acpi/button/lid/*/state
 if [ $? != 0 ]; then
   logger "action_lid.sh: lid is not closed. Bailing out."
   exit 0
 fi
 
 
 # Shutdowns instead of sleeping if no one is logged in.
 if ! test -f /var/run/state/logged-in; then
   logger "action_lid.sh: lid closed. Shutting down since no one is logged in"
   shutdown -h now
   exit 0
 fi
 
 logger "action_lid.sh: lid closed. Going to suspend-to-RAM state"
 
 # On lid close:
 # - locks the screen
 export HOME=/home/chronos
 /usr/bin/xscreensaver-command -l
 
+# - logs the time going to suspend (no-op if no RTC).
+cp /sys/class/rtc/rtc0/since_epoch /var/log/metrics/suspend-to-ram-time \
+  2> /dev/null || true
+
 # - announces the event
 /usr/bin/dbus-send --type=signal --system / \
   org.chromium.Power.Manager.PowerStateChanged string:mem
 
 # - sleeps for a bit to give the window manager time to draw the xscreensaver
 #   window to the screen -- see http://crosbug.com/2250.
 # TODO: Remove this hack once we have a better solution in place that adds
 # some coordination between the screen locker and the window manager.
 sleep 0.5
 
 # - suspends the cryptohome device
 #CRYPTOHOME=/dev/mapper/cryptohome
 #/usr/bin/test -b $CRYPTOHOME && /sbin/dmsetup suspend $CRYPTOHOME
 
 # - suspends to ram
 echo -n mem > /sys/power/state
 
 # On lid open:
 # - has it such that you don't have to press a key to display lock screen
 /usr/bin/xscreensaver-command -deactivate
 
 # - announces the event
 /usr/bin/dbus-send --type=signal --system / \
-  org.chromium.Power.Manager.PowerStateChanged string:on
+  org.chromium.Power.Manager.PowerStateChanged string:on &
+
+# - sends UMA metrics on resume
+/usr/bin/send_metrics_on_resume
 
 # - resumes cryptohome device
 #/usr/bin/test -b $CRYPTOHOME && /sbin/dmsetup resume $CRYPTOHOME