Description: "`type` indicates whether this priority level is subject to limitation on request execution.  A value of `\"Exempt\"` means that requests of this priority level are not subject to a limit (and thus are never queued) and do not detract from the capacity made available to other priority levels.  A value of `\"Limited\"` means that (a) requests of this priority level _are_ subject to limits and (b) some of the server's limited capacity is made available exclusively...

if(cb instanceof Task){this.afterTask_=cb;}else{this.afterTask_=new Task(cb,thisArg);}

          "description": "`type` indicates whether this priority level is subject to limitation on request execution.  A value of `\"Exempt\"` means that requests of this priority level are not subject to a limit (and thus are never queued) and do not detract from the capacity made available to other priority levels.  A value of `\"Limited\"` means that (a) requests of this priority level _are_ subject to limits and (b) some of the server's limited capacity is made available exclusively...