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Anker is a well known brand in the world of charging solutions for mobile devices and released the Anker PowerPort+ 5 USB-C with USB Power Delivery for USB Power Delivery enabled products like the HP Chromebook 13 G1.  Let's see how well the Anker PowerPort+ 5 USB-C with USB Power Delivery charges the HP Chromebook 13 G1. 

We start by verifying the USB Power Delivery communication between the Anker charger and the Chromebook.

Using software from Granite River Labs to capture the USB Power Delivery Protocol transaction, we can see that the Anker PowerPort+ 5 USB-C with USB Power Delivery first advertises that it supports 3 different PDO's (Power Data Objects): 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 45 watts (15 volts @ 3 amps).

The Anker PowerPort+ 5 USB-C with USB Power Delivery later advertises it supports four different PDO's: 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 45 watts (15 volts @ 3 amps), and 45 watts (20 volts @ 2.25 amps).  Note it's not USB compliant behavior to have a charger advertise different PDO's.

We see that the HP Chromebook 13 G1 first chose the first PDO, request 5 volts @ 3 amps, but later requested the third PDO, upping the power requested to 15 volts @ 3 amps. 

Looking at the actually current and voltage being pulled on an oscilloscope, we see the current peaking at 1.56 amps, while most of the time being at around 1 amp. The voltage does stay at 15 volts. Note these measurements were taken when the HP Chromebook 13 G1  was nearly fully charged.  We'll next compare that with the Chromebook's battery depleted.

It's interesting to note that at a similar charge level also at 85-90%, the iVoler 75W USB Type C Charger with Power Delivery provides more power with 20 volts @ 1.8-2.3 amps to the Chromebook.