[Merge] lp:~phablet-team/mir/track-plug-state into lp:mir

[PS Jenkins bot]

The proposal to merge lp:~phablet-team/mir/track-plug-state into lp:mir has been updated.

    Status: Approved => Needs review

For more details, see:
https://code.launchpad.net/~phablet-team/mir/track-plug-state/+merge/285854
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