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Add unit tests for SettingsToCupsOptions() in
printing_context_chromeos.cc.

Also refactor the code a bit to expose this function for testing.

Bug: 1001398
Test: ./printing_unittests

Cq-Depend: 2390967
Change-Id: Id0c0765e5ce6a3f3cde3d294afce33c9720f215a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389102
Commit-Queue: Pranav Batra <batrapranav@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805084}