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CUPS destination names and info are organized differently of macOS and
other CUPS platforms. On macOS, the destination name is stored in the
"printer-info" option, while the description (usually the make and
model) is stored in the "printer-make-and-model" option. In contrast,
on other platforms, the name is reliably stored in the |name|
attribute of the cups_dest_t struct, and the description is stored in
the "printer-info" option.

Additionally, populate the |device_name| attribute of |printer_info|
in CupsPrinter::ToPrinterInfo(), so the name gets plumbed up to the
print preview UI.

Meanwhile, consolidate some common CUPS consts into
print_backend_consts.h.

Bug: 226176
Change-Id: Idb71bf7ad7602dcf185d4f49d81294b13d70365d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066297
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746974}