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."

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=18ec901

[Benson Leung, 2011-03-19 07:03:31]

Quick CL to allow powerm to read from /var/lib/power_manager in cases where we
want to override a default preference.

[tbroch1, 2011-03-19 15:43:34]

LGTM w/ nit, add reference to related CL 6712052 in description
On 2011/03/19 07:03:31, Benson Leung wrote:
> Quick CL to allow powerm to read from /var/lib/power_manager in cases where we
> want to override a default preference.