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: de016e52bd170d2d4f2344f9bf92d50478b649e0@37727 0039d316-1c4b-4281-b951-d872f2087c98

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