This is quite useful for developers to debug cpu and memory usage as well as GC timers.
Created attachment 300406 [details]
You can see a screenshot here:
This is just an initial version, it doesn't have cool graphs showing the history like the Apple one, but we can add more stuff later.
Comment on attachment 300406 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=300406&action=review
> + page/linux/ResourceUsageOverlayLinux.cpp
> + page/linux/ResourceUsageThreadLinux.cpp
You have to add this in a Linux conditional somewhere... it's not going to work on FreeBSD or Darwin.
Committed r211631: <http://trac.webkit.org/changeset/211631>