Add some more detail to PLOGs when debugging problems
Add some more detail to PLOGs when debugging problems

BUG=none
TEST=build

Review URL: http://codereview.chromium.org/5656003

git-svn-id: http://src.chromium.org/svn/trunk/src@68684 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4c51edcbc4d1720aa739400f0e17d2a4b128af32
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