Change default for profiler page to count with no grouping
Change default for profiler page to count with no grouping

The motivation is that the first thing to do in optimization is to see what tasks we can do less of (not merely make faster), so showing the largest counts helps.  In addition, by not grouping, the first page gives a broad overview of what is "happening" in the browser, especially of there are a wild number of any task on any thread.

Also pushed aggregation row to above the header row.

r=eroman
Review URL: http://codereview.chromium.org/8474017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@108818 0039d316-1c4b-4281-b951-d872f2087c98

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