I don't think this has been done before, or not extensively.
At home I have got all these different USB power adapters, the Apple 5W, 10W and 12W charger, as well as those "Android chargers" which came with my android devices.
I always wondered how my Android phone (Nexus 5 in this case) would behave if they got plugged into those Apple chargers, does the phone see it as USB adapter and take only the USB standard 2.5W, or actually properly charge it?
In this video I used the Charger Doctor I got off eBay for testing.
Spoiler alert: The LG charger that came with my Nexus 5 is not that good.
YouTube link in case embedded didn't work: