xster f187a5c219 Create platform API for first frame callback. Use for defer hiding splash screens on Android and iOS (#3956)
* 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
2017-08-14 15:44:52 -07:00
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