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

[Gerry Boland]

Gerry Boland has proposed merging lp:~gerboland/qtubuntu/rasterGLSurface into lp:qtubuntu.

Commit message:
Fix rendering of apps using QQuickWidget

- 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:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~gerboland/qtubuntu/rasterGLSurface/+merge/306915
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~gerboland/qtubuntu/rasterGLSurface into lp:qtubuntu.
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