Add to the Request class a method to access the map of Stream to Buffer. With the introduction of multiple stream support, pipeline handler should be able to access the map of streams at request queueing time. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>