Add a configurable amount of space between the notification balloons.
Add a configurable amount of space between the notification balloons.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/521030

git-svn-id: http://src.chromium.org/svn/trunk/src@35542 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 559672fd410c713d3027712699224989ae0ae9e6
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