<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def register_app(self, app):
 """Register the route object to a `bottle.Bottle` app instance. Args: app (instance):
 Returns: Route instance (for chaining purposes) """

        app.route(self.uri, methods=self.methods)(self.callable_obj)

        return self