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DDoc: go/cups-plugin

Adds flag to condition above printing pipeline on. Will be used to
condition the CupsProxyService startup.

Bug: chromium:495409
Test: build unit_tests & run CheckHistograms + EveryFlagHasMetadata
Change-Id: Id4b75ceca33a9930992e1732537621cbc154a64b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601835Reviewed-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@{#658334}