[Merge] lp:~dandrader/qtubuntu/offscreenSurface-lp1527737 into lp:qtubuntu

[Daniel d'Andrada]

The proposal to merge lp:~dandrader/qtubuntu/offscreenSurface-lp1527737 into lp:qtubuntu has been updated.

Commit Message changed to:

Implement QPlatformOffscreenSurface

Otherwise Qt might create a full QPlatformWindow during shutdown (which will cause the creation of a mir surface) while cleaning up the GL context and we don't want that.

For more details, see:
https://code.launchpad.net/~dandrader/qtubuntu/offscreenSurface-lp1527737/+merge/281638
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Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~dandrader/qtubuntu/offscreenSurface-lp1527737 into lp:qtubuntu.