Allow powerm to read prefs from /var/lib/power_manager
Allow powerm to read prefs from /var/lib/power_manager

Allow prefs from /var/lib/power_manager to override
the  default ones in /usr/share/power_manager.

This CL is related to http://codereview.chromium.org/6712052.
These two CLs may be used to disable lid functionality
by creating /var/lib/power_manager/use_lid, and setting
the pref to 0.

Change-Id: I673f2bd1f2c48da74df16f54afe965f45dde49cf
Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Todd Broch <tbroch@chromium.org>

BUG=chromium-os:13260
TEST=
echo 0 > /var/lib/power_manager/use_lid
sudo restart powerm
Close the lid. Ensure that the lid is ignored.
Watch /var/log/power_manager/powerm.LATEST for "Ignoring Lid."

Review URL: http://codereview.chromium.org/6712051

joshfire/chromiumos-platform-init