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Printer types that can be blacklisted include privet, PDF, local,
extension, and cloud printers.

If a certain printer type is on the blacklist, calls of 'getPrinters'
for that type would immediately resolve without dispatching any Web UI
events. Calls of 'getPrinterCapabilities' for a blacklisted printer
type would be rejected.

Because cloud printers are fetched separately, if cloud printers are on
the blacklist, the pref will have the same effect as setting the
"CloudPrintSubmitEnabled" policy to false.

This is the first CL to implement a policy disabling certain printer
types. A future CL will add the policy configurations.

Bug: 487875
Change-Id: I3bd4e1d3d3ecae3c2a6c379f3b3ae009b2c4921c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881844
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712342}