* Move texture registry ownership to platform view
This enables the texture registry to survive activity pause on Android.
* Remove debug info
* Formatted
* Set texture registry on initial rasterizer
* Remove unneccessary std::move
* Add back launch screen view until first frame on iOS
* improvements
* Move callback plumbing from ios surfaces to the gpu rasterizer. Didn’t wire java JNI yet.
* Android JNI
* Fix ios reference count and let android engine manage a view on top with launch screen
* Hook up Android activity and view
* review notes
* review notes
* Move thread switching upstream. Use weak references for callbacks.
* Some clean up
