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

[Michael Terry]

I tested this on the phone with the Music app:

QSG_RENDER_TIMING=1 QT_LOGGING_RULES="ubuntumirclient=true" qmlscene -qt5 /usr/share/click/preinstalled/com.ubuntu.music/current/app/music-app.qml --desktop_file_hint=/usr/share/click/preinstalled/com.ubuntu.music/current/com.ubuntu.music_music.desktop

Worked great!  I want to try to do some testing with the Desktop stage, but I haven't noticed a regression like bug 1514556 yet.
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https://code.launchpad.net/~nick-dedekind/qtubuntu/occlusion-2.0/+merge/283194
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