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This CL expands the navigation suggestion feature by looking for potential suggestions in the engaged sites list using the site engagement service.

The match is still done by computing ICU skeletons of the hostnames. The skeletons are calculated from the eTDL+1 portions of the navigated and engaged sites, so that a navigation to a subdomain of a site looking similar to an engaged site successfully triggers the UI.

Design: https://docs.google.com/document/d/1gQCTenYuRnP77nMOo8RpS3SUxCiVewxQ9uQ3fuSefdY/edit?usp=sharing
Bug: 847662
Change-Id: I708b8f2503b16da8241145afe2f4aa0d2c001b9c
Reviewed-on: https://chromium-review.googlesource.com/1162919
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582218}