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The goal is to offer a shortcut for cases when tests may either
enable or disable a feature based on a condition.

Examples that could be simplified if such method exists:
 - https://cs.chromium.org/chromium/src/components/autofill/core/browser/form_structure_unittest.cc?l=50
 - https://cs.chromium.org/chromium/src/ui/app_list/views/search_result_page_view_unittest.cc?l=62

Change-Id: I408cae760aa6a031770498202eb817e3bbd63a6b
Reviewed-on: https://chromium-review.googlesource.com/1005421Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549704}