Index: wp-cron.php
===================================================================
--- wp-cron.php	(revision 22145)
+++ wp-cron.php	(working copy)
@@ -90,6 +90,7 @@
 			wp_unschedule_event( $timestamp, $hook, $v['args'] );
 
  			do_action_ref_array( $hook, $v['args'] );
+			do_action( 'did_cron', $hook, $timestamp, $v );
 
 			// If the hook ran too long and another cron process stole the lock, quit.
 			if ( _get_cron_lock() != $doing_wp_cron )