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This CL adds the visual elements but omits most of the plumbing necessary to combine all the prefs controlled by this toggle.  That will come in a follow up CL.

Bug: 1032584
Change-Id: I9c4770d88a91774fcd9efa65832ff3b07a3b8d71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092591
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Auto-Submit: Sean Harrison <harrisonsean@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748487}