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This callback can be used to notify FullscreenControllerObservers of
changes to the viewport inset range.  It can be used to trigger a
viewport adjustment for new toolbar heights.

Bug: 674649
Change-Id: I4ecdc374c1017716518118a27d4b9c5e0f1db48f
Reviewed-on: https://chromium-review.googlesource.com/c/1340953
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613313}