Move the native methods out to a separate AppSupport class so that they aren't
in our "experimenal" Desktop app's namespace. Don't hardcode the name of that
class in the native code, but have the app register the class to which the
damage callbacks should be done.

Possibly the AppSupport and Bootstrap classes should be combined. Later.

Also, the "android" part of the package name is superfluous; it is
Android-specific code, no information gained by having an "android" part in
the package name.

Change-Id: Iddf55c8034ead7693887ace8438deb002c5eea9f