Alter cron queue information before cron runs.
Called by drupal_cron_run() to allow modules to alter cron queue settings before any jobs are processesed.
array $queues: An array of cron queue information.
function hook_queue_info_alter(&$queues) {
// This site has many feeds so let's spend 90 seconds on each cron run
// updating feeds instead of the default 60.
$queues['aggregator_feeds']['cron']['time'] = 90;
}