This could be useful to quickly profile a page. It oculd be quicker than using console.profile() or in a production environment.
Definitely. I went to do some profiling of a webapp that does the bulk of its work onload and it took me a while to figure out that even though the profiler panel looked like it was working, it wasn't actually still doing it after the refresh.
*** Bug 19531 has been marked as a duplicate of this bug. ***
If the profiler was recording when the user chooses to reload the page, then profiling will be restarted as the page loads, providing the desired effect.
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.
The new Inspector always records timeline data on load, which includes some scripting info (script exection, timers, events).