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This CL adds the action to focus the omnibox from the omnibox button in
the bottom toolbar.

Bug: 804717
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Id03a2aea1572bb2b23b2aa6733a5cdc1b96ccc33
Reviewed-on: https://chromium-review.googlesource.com/888583Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532355}