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This will be helpful in methods such as typeInOmnibox, which rely on
the assumption that the omnibox will have focus. Putting it in its own
util file because it seems generally useful.

Bug: 1000315
Change-Id: I7cb390046462c584ad48785963941fce133da0e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784882
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694835}