Simon Lightfoot 2b66f64511 Avoid a full screen overlay within virtual displays (flutter/engine#9343) ...

Add views that are added directly to a platform view's window as siblings to the platform view's container view, rather than as children of a full screen container.

This prevents a false-negative for a visibility check from a specific ads SDK (Teads), which [reported the following warning](https://github.com/flutter/flutter/issues/12114#issuecomment-500906158):
```
W/teads#Visibility(17978): The Teads AdView is visible at 0%, hidded by 1 View(s):
W/teads#Visibility(17978):   -  View of class io.flutter.plugin.platform.SingleViewPresentation$FakeWindowViewGroup, with id: -1, with contentDescription: null, with a size of: [width: 1050, height: 875] is hidding 100% of the ad
```

2019-06-20 16:46:26 -07:00

..

src/flutter

Avoid a full screen overlay within virtual displays (flutter/engine#9343)

2019-06-20 16:46:26 -07:00