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This required adding new API to ChromeEarlGrey to fetch the current
fullscreen viewport insets.

Bug: 987646
Change-Id: I18a897a558074025da81262b17429e09417fe61a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889112Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710988}