Add more logs in screen locker to help troublehshooting
Add more logs in screen locker to help troublehshooting

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3153023

git-svn-id: http://src.chromium.org/svn/trunk/src@56720 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: dd2f2a364bf75c322a16e9628da20d27953b4361
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser