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This CL allows to add new printing enum policies handlers by providing
only policy and pref names and map from policy string value to enum.

Bug: 1008941
Change-Id: I25be44e38b0b76dd378c2640d491bd3e4e17165b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832805Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702138}