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Wires the Java bridge into the ToolbarModel to trigger the Omnibox
Previews badge.

Also includes a small pre-s13n hack to enable the Previews UI to be
displayed when a HTTPS Lite Page Preview is shown.

Bug: 871839
Change-Id: Ia279cd6793c4517d02534a3d16029809c16b34f1
Reviewed-on: https://chromium-review.googlesource.com/1180372
Commit-Queue: Theresa <twellington@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585643}