Implementation of DataSubscriber for cases where the client wants access to a bitmap.

Sample usage:

 dataSource.subscribe( new BaseBitmapDataSubscriber() { {@literal @}Override public void onNewResultImpl(@Nullable Bitmap bitmap) { // Pass bitmap to system, which makes a copy of the bitmap. updateStatus(bitmap); // No need to do any cleanup. } {@literal @}Override public void onFailureImpl(DataSource dataSource) { // No cleanup required here. } });