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This makes OnFileAttached an alternative to legacy policies to
configure scanning settings. This is gated by a new feature.

Bug: 1067631
Change-Id: Ib97200da493176a7a4254d2f891c1625c85d42cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2162268Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762071}