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We recently starting sourcing the maximum copies value used in
Chrome from the printers; this change implements this for
non-ChromeOS platforms using CUPS.

Bug: chromium:1027830
Test: added/modified tests pass
Change-Id: I860c25f4e1d468b3785d27d6288398c8c3c83196
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130887Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760199}