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This script, if present, will always be run before the user's configured
session. The user's session will start if and only if the pre-session
script returns successfully.

Change-Id: I1e2fcb427c72cf102bb5e8da8ccf36d8209584c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595791
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838695}