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The associated-control allows the top-level Settings UI to display an arrow under a control (e.g. a button) whose subpage matches the search text.

R=hansberry@chromium.org

Bug: 901381
Test: none
Change-Id: I0e4f4c3b8939213853273a8b186ae082c5bacbed
Reviewed-on: https://chromium-review.googlesource.com/c/1319336Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605805}