task manager gtk:
task manager gtk:

When sorting by a column that is shared by resources in a group (e.g. process id or CPU, but not network), make sure those rows are grouped.

Also get rid of the confusing grid lines. I think we want separators between groups, but getting them to draw properly without introducing huge complexity to the code is hard.

BUG=none
TEST=manual

Review URL: http://codereview.chromium.org/555177

git-svn-id: http://src.chromium.org/svn/trunk/src@37727 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b9fc79256cff5fa186c5dede547e8e22dcb31c32
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