Audit the list of events which Event Timing api should report (and consider adding focus/blur)

[mmocny]

The current list of supported events is here

I'm not sure what the best way to audit the list of events is. We do explicitly exclude continuous events from reporting, but some other events seem just overlooked.

This is a good list from MDN that summarizes the plethora of events defined in different places.

The request for focus comes from a team at Microsoft, but I have also seen many websites where the focus event(s) play a significant role during interactions.

[mmocny]

Also, what about events such as: back/forward navigation, or window resize?

Those can sometimes be continuous (dragging window corner on desktop) or discrete (maximize/restore button).

[clelland]

Also see #99

@mmocny, do you want to do this audit and propose a list here?