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Adds support for showing shortcuts in the popup view controller when no
suggestions are shown.

Since the actual shortcuts are not implemented yet, a placeholder is
displayed.

Bug: 886897
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ie9afb4933b42b846d5177c1024feebf9241afdee
Reviewed-on: https://chromium-review.googlesource.com/1233706
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595814}