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This change records any requested/used model feature supported by the client
and requested to be used by a prediction model.

Bug: 1052435
Change-Id: I16e8e7b9cab39b173bdc0be5e329fb181853d656
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057121
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742747}