Only show render surface when we are ready to render

[tobrun]

Each time we load a new MapView you will see a black surface before we render any map content.

Now

Optimisations to look into:

• Only start showing surface when to render (map change event)
  • similar to Remove fragment flash #10717
• Rely on a transparent background (Transparent background #10719), determine perf. impact
• ...

Ideal result

[tobrun]

Capturing from a user that View#setForeground works well to achieve the desired effect from OP