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This change introduces a very simplistic MostVisitedTilesProcessor.
The only functionality wired up at this point is updating the
Omnibox Editing text with the associated URL and very basic keyboard
navigation.

Bug: 1106109
Change-Id: Iac224b2c625eb11d9e1a99ff21465c2b3680b3f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437690
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813039}