The Nexus 6P does have Quick Charge 2.0 compatible hardware

[cdmagurus.com]

Some interesting new information about the Nexus 6P has come to light. Francisco Franco did some digging around the issues log for the Angler -- otherwise affectionately known as the Nexus 6P -- and found comments which suggest that the device does, in fact, have proper hardware for Quick Charge 2.0.

More... (http://phandroid.com/2015/11/06/nexus-6p-quick-charge/)