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This patch adds an interface for updating the Crostini App Registry
over D-Bus at org.chromium.VmApplicationsService:UpdateApplicationList.

The proto is being added in:
https://chromium-review.googlesource.com/q/I05b05f03

Bug: 821662
Change-Id: I7effada1c0de237ef3ec49da84d5c1f76415781e
Reviewed-on: https://chromium-review.googlesource.com/965803
Commit-Queue: Timothy Loh <timloh@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547990}