UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10895.56.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.95 Safari/537.36
Platform: 10895.56.0

Steps to reproduce the problem:
1. Open any page/PDF in Chrome in ChromeOS
2. Open print dialog
3. Succesfully finish print process (e.g. successfully saved as a PDF file)
4. The print/save dialog vanished, the original page is seen.

What is the expected behavior?
The UI shows a notification that the process was succesful (e.g. similar to the "finished a download" notification).

What went wrong?
There's no notification that the process was succesful.
A user (especially a novice user) will be insecure, whether their file was saved succesfully. 

Did this work before? N/A 

Chrome version: 69.0.3497.95  Channel: n/a
OS Version: 10895.56.0
Flash Version: 

Consider to also assert that a notification is shown in ChromeOS, when using an actual printer. 
I assume that this is not the case, but I have no physical printer installed to check for this user scenario.