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This will distinguish it from the "real" container upgrade (which upgrades the
Linux distribution)

Bug: 1025629
Change-Id: Icc35ccdbbbf500ba5b9d008c81d9a1880bfffbdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923207
Auto-Submit: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#716450}