Subclassing NativeActivity makes two things possible. Firstly, we can
implement an InputConnection to offer good support for IMEs,
necessary for good keyboard support. Secondly, we can use it to
overlay WebViews onto the NativeActivity.
But to sublcass NativeActivity, we need to compile Java. To keep the
toolchain go gettable, this is done with go generate.
While here, check the exception after FindClass. Apparently it can
throw an exception.
Updates golang/go#9361.
Updates golang/go#10247.
Change-Id: I672545997f0c9a7580f06988a273c03404772247
Reviewed-on: https://go-review.googlesource.com/11980
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
