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Also fixes bugs with the SwitchItem and adding test for the
ChromeTableViewControllerTest platform test helper.

Bug: 894791
Change-Id: Ib2d4631ac65ce380dbe18d43603a34e74baec66c
Reviewed-on: https://chromium-review.googlesource.com/c/1297977
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603121}