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This adds evidence_locker_filepath in ContentAnalysisResponse::Result
and a corresponding reporting field.

This should be removed once a better propagation for this info is
agreed upon.

Bug: 1147036
Change-Id: I496d13a80fd7f06a83f534afa0b6d673184a6bfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526929
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825447}