In Nov 2016, Google called for OEMs to conform to the USB Type-C Power Delivery standards, QualComm responded that its Quick Charge 4.0 technology will be compatible with USB Type-C and USB Power Delivery (USB-PD) specifications.
Its Quick Charge 4.0 technology will be compatible with USB Type-C and USB Power Delivery (USB) specifications. This was what QualComm responded in Nov 2016, Google called for OEMs to conform to the USB Type-C Power Delivery standards. USB was PD.