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A call to UpgradeContainer can start off a long-running upgrade process
via the Cicerone daemon. A dbus signal UpgradeContainerProgressSignal is used
to communicate progress to Chrome, including the final success or failure of
the upgrade itself.

Bug: 930901
Change-Id: Ibdbd1a9be4ac852c93dd98257b387417c85b5dd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850688Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Auto-Submit: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705841}