[Merge] lp:~albaguirre/ubuntu-touch-session/enable-overlays into lp:ubuntu-touch-session

[Alberto Aguirre]

The spinner halt/stopping has been fixed in mir: 

https://code.launchpad.net/~kdub/mir/fix-1352883

Once that lands we should silo and test this again.

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https://code.launchpad.net/~albaguirre/ubuntu-touch-session/enable-overlays/+merge/229112
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