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FullscreenModel knows enough information to calculate these insets, so
it makes sense for the calculation to occur there.  Exposing the
viewport insets in FullscreenController will allow chrome/ layer UI
code to easily account for viewport adjustments.

This API will be used to mask non-modal UIAlertController presentation.

Bug: 674649
Change-Id: I469cb133ef5d27bffcd4de5070bd12820514740e
Reviewed-on: https://chromium-review.googlesource.com/c/1339460
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612538}