Access to Android surface native handles...

I'm working with an unreleased VR dev kit that's based on Android.  The SDK for presenting VR images requires access to the native window surface: `ANativeWIndow*`.  There doesn't appear to be any way to access the underlying window surface from Qt C++ code.  I believe it might be possible to work with the EGLSurface instead, but again, there's no way of accessing this, either through the QPlatformNativeInterface or the QOpenGLContext::nativeHandle mechanisms.  Nor can I find any mechanism of fetching the JNI object for the android Surface object for a given GL window.  

I'm currently looking at potentially modifying QtActivityDelegate.java to try to hack something together for a prototype, but with the core Qt libraries, this dev kit is completely unusable.