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Unlike other printer settings, color does not have its own function in
the Core Printing API [1]. Therefore, color needs to be set using the
generic PMPrintSettingsSetValue() function. When printing using CUPS
IPP, the passed key-value pair must be IPP constants.

All other printer settings work fine with CUPS IPP because they are
handled with their own Core Printing functions.

[1] https://developer.apple.com/documentation/applicationservices/core_printing

Bug: 1106437
Change-Id: I7ad153fc97f9e5797b263a6ec2ac10726deb27b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303992
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789726}