Support for the native-world.

[cia48621793]

So I was initializing Mono in a Java program through JNI, yet the Mono runtime couldn't sense the Java runtime at all! java.interop didn't work in this case and I was forced to use the internal implementation callbacks strategy which is pretty verbose and hard-work for me, since I have to port a lot of methods, marshalling, conversion, etc, it was quite messy, but it works anyway.
But I can provide the JVM pointers from native world...I think it could be very cool to let user running java.interop from native world.

[cia48621793]

Looks like I misread some documentations...

[cia48621793]

I overlooked the `JniRuntime::CreationOptions` class, by supplying `InvocationPointer` and `EnvironmentPointer`, this might work out.

[jonpryor]

@cia48621793: You might find AndroidRuntime useful.

[jonpryor]

Closing this issue because I'm not sure what is being asked.