* 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
Sometimes, plugin instances need access to the `FlutterView`.
They can currently cast the `messenger()`, but that's fragile.
This adds API support for getting the view from the registry.
* Revert "Enable line join styles and miter limit. (#3777)"
This reverts commit 5403f65bcad98bd0d434cae590e2a337a1ea218c.
* Revert "Revert "Update switches to use StringView." (#3784)"
This reverts commit 80f039ff324b827cc17567867bd17c788277b0cf.
* Revert "Initial integration of libtxt with Flutter alongside Blink. (#3771)"
This reverts commit c548c65b5020653087b63f1f156741a1f95b5117.
This factors the functionality that was in `FlutterActivity`
to live in `FlutterActivityDelegate`. This will allow the creation of a
`FlutterFragmentActivity` that has the same core functionality, which in
turn unlocks certain Android plugins that choose to require the v4
support library (like Google Sign-In).
https://github.com/flutter/flutter/issues/10072
