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This CL renders the options provided by the native backend.
To do that, it introduces new |Item.Type|s.

Bug: 853747
Change-Id: I6fcd833a1674d55da4e4e44d9517e3aff35da823
Reviewed-on: https://chromium-review.googlesource.com/1110217
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569624}