The current profiles UI in the Inspector doesn't give any indication of when a profile was taken, or for how long it ran. Having this information would be useful, as it would provide more information about what was going on at the time the profile was taken.
One idea I had was to put profiles on a timeline. That would make it really easy to see when they started/stopped, and also to see any overlapping profiles.
If we do put this information into a timeline, it probably makes sense to unify it with the resource-loading timeline in the Resources panel. See bug 26406 for another idea which might warrant extending the resource-loading timeline to show more types of information.
<rdar://problem/8630437>
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.