[Merge] lp:camera-app/staging into lp:camera-app

[Florian Boucault]

Florian Boucault has proposed merging lp:camera-app/staging into lp:camera-app.

Commit message:
Startup time improvements:
- Load view finder overlay synchronously thus avoiding a black screen.
- Faster and cached AdvancedCameraSettings.videoSupportedResolutions(). Saves around 1000ms on krillin.
- Cache StorageLocation::removableStorageLocation. Saves around 200ms on krillin.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1563858 in camera-app (Ubuntu): "Cannot open camera controls in landscape mode"
  https://bugs.launchpad.net/ubuntu/+source/camera-app/+bug/1563858
  Bug #1572576 in qtubuntu-camera (Ubuntu): "Taking a photo not working / xenial"
  https://bugs.launchpad.net/ubuntu/+source/qtubuntu-camera/+bug/1572576
  Bug #1584524 in camera-app (Ubuntu): "camera app gets baffled when maximising desktop version"
  https://bugs.launchpad.net/ubuntu/+source/camera-app/+bug/1584524
  Bug #1585942 in mesa (Ubuntu): "Mesa causes a segmentation fault on arm64 (wrong count of uniform locations)"
  https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1585942

For more details, see:
https://code.launchpad.net/~phablet-team/camera-app/staging/+merge/298329

Startup time improvements:
- Load view finder overlay synchronously thus avoiding a black screen.
- Faster and cached AdvancedCameraSettings.videoSupportedResolutions(). Saves around 1000ms on krillin.
- Cache StorageLocation::removableStorageLocation. Saves around 200ms on krillin.


-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:camera-app/staging into lp:camera-app.
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