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Add support for "Query Suggest" in the Physical Web omnibox provider.
Previously, the omnibox would only display Physical Web omnibox suggestions
when the user had not yet entered any text in the omnibox ("Zero Suggest").
With this CL, Physical Web suggestions may be displayed if the URL and page
title match all the terms in the omnibox query string.

BUG=630769

Review-Url: https://codereview.chromium.org/2591053002
Cr-Commit-Position: refs/heads/master@{#442098}