Seems to me FlameChart is more powerful and flexible instrument than plain old ProfileTree in DataGrid.
The same action like 'look for the most expensive function' could be easily done with FlameChart and need number of clicks in DataGrid.
So in an offline discussion we decided to place FlameChart on top of DataGrid.
Created attachment 195285 [details]
Comment on attachment 195285 [details]
Please provide the screenshot.
Created attachment 195310 [details]
Committed r146987: <http://trac.webkit.org/changeset/146987>