[Merge] lp:~nick-dedekind/qtubuntu/occlusion-2.0 into lp:qtubuntu

[Nick Dedekind]

Nick Dedekind has proposed merging lp:~nick-dedekind/qtubuntu/occlusion-2.0 into lp:qtubuntu with lp:~nick-dedekind/qtubuntu/cross-build-support as a prerequisite.

Commit message:
Re-added window exposure for occlusion detection

Requested reviews:
  Michael Terry (mterry)
  PS Jenkins bot (ps-jenkins): continuous-integration
  Unity8 CI Bot (unity8-ci-bot): continuous-integration
Related bugs:
  Bug #1475678 in QtMir: "Unity8 not informing clients that they are not visible and thus can stop rendering"
  https://bugs.launchpad.net/qtmir/+bug/1475678

For more details, see:
https://code.launchpad.net/~nick-dedekind/qtubuntu/occlusion-2.0/+merge/297315

* Are there any related MPs required for this MP to build/function as expected? Please list.
https://code.launchpad.net/~nick-dedekind/qtmir/occlusion-2.0/+merge/283197

 * Did you perform an exploratory manual test run of your code change and any related functionality?
Yes
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