[Merge] lp:~albaguirre/qtubuntu/use-mir-surface-apis into lp:qtubuntu

[Daniel d'Andrada]

Review: Approve


"""
QSGGuiThreadRenderLoop::renderWindow
QSGGuiThreadRenderLoop::exposureChanged
QQuickWindow::exposeEvent
QGuiApplicationPrivate::processExposeEvent
QWindowSystemInterface::handleExposeEvent
"""

I think that call stack will only happen if event delivery is synchronous (synchronousWindowsSystemEvents), which I think (and hope) it's not our case.

But anyway, if you checked and did see the results you expected than that's enough for me. Won't delve into it.
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https://code.launchpad.net/~albaguirre/qtubuntu/use-mir-surface-apis/+merge/267228
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