Chrome Version: 65.0.3287.0 canary
OS: 10194.0.0 (Official Build) canary-channel lulu

What steps will reproduce the problem?
(1) Start adding a printer
(2) Try to pick a PPD
(3) Click Add

What is the expected result?
The printer is added

What happens instead?
PPD download fails

Interesting chrome log follows:

[4050:4050:1207/111811.228132:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer x
[4050:4050:1207/111811.426234:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xe
[4050:4050:1207/111811.551346:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xer
[4050:4050:1207/111811.814276:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xero
[4050:4050:1207/111812.021825:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xerox
[4050:4050:1207/111831.743730:ERROR:ppd_provider.cc(452)] PPD xerox workcentre 470cx not found in server index
[4050:4050:1207/111831.744014:ERROR:cups_printers_handler.cc(630)] Unrecoverable error.  Reboot required.
[4050:4050:1207/111850.309874:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer x
[4050:4050:1207/111850.456092:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xe
[4050:4050:1207/111850.571242:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xer
[4050:4050:1207/111850.720230:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xero
[4050:4050:1207/111850.841178:ERROR:ppd_provider.cc(467)] Can't resolve printers for unknown manufacturer xerox
[4050:4050:1207/111905.450186:ERROR:ppd_provider.cc(452)] PPD xerox workcentre 7228 not found in server index
[4050:4050:1207/111905.450281:ERROR:cups_printers_handler.cc(630)] Unrecoverable error.  Reboot required.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.