[Merge] lp:~gerboland/qtubuntu/rasterGLSurface into lp:qtubuntu

[Gerry Boland]

Gerry Boland has proposed merging lp:~gerboland/qtubuntu/rasterGLSurface into lp:qtubuntu with lp:~nick-dedekind/qtubuntu/lp1596524.use-pbuffers as a prerequisite.

Commit message:
Fix rendering of apps using QQuickWidget

Based on a branch by Daniel d'Andrada
- Advertise RasterGLSurface capability
- Implement proper offscreen rendering support using EGL pixel buffers.
- Don't create mir surfaces for Qt::Desktop QWindows. Proper implementation still pending
- Add BackingStore toImage method, fixes render of QQuick and Widget content

Requested reviews:
  Daniel d'Andrada (dandrader)
  Unity8 CI Bot (unity8-ci-bot): continuous-integration

For more details, see:
https://code.launchpad.net/~gerboland/qtubuntu/rasterGLSurface/+merge/307007

Tested working correctly on Desktop (Mesa), Nexus 4 & 7, Meizu MX4, Bq Aquaris 4.5.
M10 has rendering problems, still unresolved.

Good test is the "quickwidget" demo in qtdeclarative5-examples as it uses QQuickWidget, which combines QML and Widget content in a single window. You can also test QtCreator
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