[automerger skipped] Backport PackageListObserver#onPackageChanged.
am: 7b0411782a -s ours
am skip reason: change_id Ic48e3c728387ecf02f89d517ba1fe785ab9c75fd with SHA1 d8eb8b2690 is in history

Change-Id: I3697d302e27b111e5ecbce2610183b6562c00ae0