messaging-app should run confined

For reference, this is what was done for webbrowser-app to make it run confined:
https://code.launchpad.net/~osomon/webbrowser-app/apparmor-profile/+merge/272850

Status changed to 'Confirmed' because the bug affects multiple users.

This bug was fixed in the package messaging-app - 0.1+16.04.20160205-0ubuntu1

---------------
messaging-app (0.1+16.04.20160205-0ubuntu1) xenial; urgency=medium

  [ Arthur Mello ]
  * Add a thumbnail to MMS previewer after video has ended to reduce
    visual issues
  * Add audio attachments text to ThreadDelegate
  * Add initial QML test for voice recording
  * Add initial voice recording support. Most of the code was originally
    written by Arthur Renato Mello.
  * Add video attachment delegates
  * During audio playback bar pause instead of stop
  * Implement swipe-to-cancel for audio recording, and change the UI to
    be compliant with the designs.

  [ Gustavo Pichorim Boiko ]
  * Add audio attachments text to ThreadDelegate
  * Add delivery status indication on bubbles.
  * Add fallback accountId to the history filter.
  * Add initial QML test for voice recording
  * Add initial voice recording support. Most of the code was originally
    written by Arthur Renato Mello.
  * Disable tests that are currently failing.
  * Display dialog to warn users that the maximum file size was reached.
  * Do not reload the history filters when just the active accounts have
    changed.
  * Enable document attachments.
  * Fix the swipe to cancel audio recording.
  * Implement swipe-to-cancel for audio recording, and change the UI to
    be compliant with the designs.
  * Load audio and sticker components asynchronously.
  * Make it possible to share contacts and extra content types (disabled
    for now).
  * Move the bottom part of Messages view to a separate QML file for
    better code readability.
  * Prototype implementation for stickers support.
  * Refactor MMSAudio delegate
  * Show an overlay icon and a background image depending on the
    protocol used.
  * Update the bubble to match the designs.

  [ Tiago Salem Herrmann ]
  * Add apparmor profile and enable app confinement. (LP: #1528625)
  * Add delivery status indication on bubbles.
  * Add fallback accountId to the history filter.
  * Add video attachment delegates
  * Display dialog to warn users that the maximum file size was reached.
  * Load audio and sticker components asynchronously.
  * Refactor MMSAudio delegate

  [ Ugo Riboni ]
  * Prototype implementation for stickers support.

 -- Gustavo Pichorim Boiko <email address hidden> Fri, 05 Feb 2016 01:10:31 +0000