Allow chaining queueable methods onto trait dispatch.

src/Illuminate/Foundation/Bus/Dispatchable.php

@@ -7,10 +7,10 @@ trait Dispatchable
     /**
      * Dispatch the job with the given arguments.
      *
-     * @return void
+     * @return \Illuminate\Foundation\Bus\PendingDispatch
      */
     public static function dispatch()
     {
-        return dispatch(new static(...func_get_args()));
+        return new PendingDispatch(new static(...func_get_args()));
     }
 }

src/Illuminate/Foundation/Bus/PendingDispatch.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Illuminate\Foundation\Bus;
+
+class PendingDispatch
+{
+    /**
+     * Create a new pending job dispatch.
+     *
+     * @param  mixed  $job
+     * @return void
+     */
+    public function __construct($job)
+    {
+        $this->job = $job;
+    }
+
+    /**
+     * Set the desired connection for the job.
+     *
+     * @param  string|null  $connection
+     * @return $this
+     */
+    public function onConnection($connection)
+    {
+        $this->job->onConnection($connection);
+
+        return $this;
+    }
+
+    /**
+     * Set the desired queue for the job.
+     *
+     * @param  string|null  $queue
+     * @return $this
+     */
+    public function onQueue($queue)
+    {
+        $this->job->onQueue($queue);
+
+        return $this;
+    }
+
+    /**
+     * Set the desired delay for the job.
+     *
+     * @param  \DateTime|int|null  $delay
+     * @return $this
+     */
+    public function delay($delay)
+    {
+        $this->job->delay($delay);
+
+        return $this;
+    }
+
+    /**
+     * Handle the object's destruction.
+     *
+     * @return void
+     */
+    public function __destruct()
+    {
+        dispatch($this->job);
+    }
+}