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These containers will be used to present the banner and modal view
controllers.

Bug: 1030357
Change-Id: I824563eb5b028b576dc29eb270685711e148f87b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033339
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742229}