class MyController1 extends BaseController{

    public function notify($id,$message){
        //Sending a push notification
        //Google Cloud Messaging Here
        //****//
    }
}

Route::get("/sendMessage" , MyController1@notify);

https://mysite.com/sendMessage?id=1&message=Hello

class MyController2 extends BaseController{

    public function something(){
         $con = new MyController2();
         $con->notify($id,$message);

    }
}

Route::get('sendMessage/{id}/{msg}'

https://mysite.com/sendMessage/1/Hello

Route::get("/sendMessage/{id}/{message}" , MyController1@notify);