Google already has all your usage history.

You can view it yourself by dialing ##INFO## aka ##4636## and then selecting "Usage data".

You’ll see all apps you’ve used, for how long you’ve used them overall, how many times, and when the last time was.

EDIT:

    *#*#4636#*#*

This goddamn markup on HN is utterly broken, I wish it would someday get fixed. But no, of course not.