Macro frame_benchmarking::cb_add_benchmarks

macro_rules! cb_add_benchmarks {
    ( $params:ident, $batches:ident, [ $name:path, $( $location:tt )* ] ) => { ... };
    ( $params:ident, $batches:ident, [ $name:path, $( $location:tt )* ] $([ $names:path, $( $locations:tt )* ])+ ) => { ... };
}

Callback for define_benchmarks to call add_benchmark.