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Offers a toggle in the customize dialog that hides modules on the NTP.
Screenshot (shown): https://screenshot.googleplex.com/BKvcrirTE6quvdi
Screenshot (hidden): https://screenshot.googleplex.com/AxMQ6DZa3MrHopf

Upon closing the customize dialog the visibility will be applied to the
current NTP and saved to prefs.

Bug: 1135393
Change-Id: I1dde6109ab3b8acccee5a4c57681a42302fbec76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454329
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814816}