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(1) Added relevance score, which indicates how well the result matches
    the user's query.
(2) Added settings page hierarchy, an array of strings to be used for
    breadcrumbs. The implementation adds dummy values for this field and
    has a TODO to implement them properly.

These changes are required by the Launcher UI code and unblock their
team's development.

Bug: 1059099
Change-Id: I46e9a6ca3bad830446eb0d415d368b4fb750b335
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153271Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760194}