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This script will be uploaded along with the updater artifacts
to the signing infrastructure, where it will be run to produce
signed builds of the updater.

It is also possible to run it locally, provided the developer
has all the necessary dependencies.

Bug: 926234
Change-Id: I75ff5989b7e1fe3732b5ec43709ff13bfa67029e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393063
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807588}