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diff --git a/vendor/symfony/http-kernel/Debug/TraceableEventDispatcher.php b/vendor/symfony/http-kernel/Debug/TraceableEventDispatcher.php
new file mode 100644
index 000000000..eb1d8a8e9
--- /dev/null
+++ b/vendor/symfony/http-kernel/Debug/TraceableEventDispatcher.php
@@ -0,0 +1,99 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Debug;
+
+use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher as BaseTraceableEventDispatcher;
+use Symfony\Component\HttpKernel\Profiler\Profiler;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Collects some data about event listeners.
+ *
+ * This event dispatcher delegates the dispatching to another one.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TraceableEventDispatcher extends BaseTraceableEventDispatcher
+{
+    /**
+     * Sets the profiler.
+     *
+     * The traceable event dispatcher does not use the profiler anymore.
+     * The job is now done directly by the Profiler listener and the
+     * data collectors themselves.
+     *
+     * @param Profiler|null $profiler A Profiler instance
+     *
+     * @deprecated since version 2.4, to be removed in 3.0.
+     */
+    public function setProfiler(Profiler $profiler = null)
+    {
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.4 and will be removed in 3.0.', E_USER_DEPRECATED);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function preDispatch($eventName, Event $event)
+    {
+        switch ($eventName) {
+            case KernelEvents::REQUEST:
+                $this->stopwatch->openSection();
+                break;
+            case KernelEvents::VIEW:
+            case KernelEvents::RESPONSE:
+                // stop only if a controller has been executed
+                if ($this->stopwatch->isStarted('controller')) {
+                    $this->stopwatch->stop('controller');
+                }
+                break;
+            case KernelEvents::TERMINATE:
+                $token = $event->getResponse()->headers->get('X-Debug-Token');
+                // There is a very special case when using built-in AppCache class as kernel wrapper, in the case
+                // of an ESI request leading to a `stale` response [B]  inside a `fresh` cached response [A].
+                // In this case, `$token` contains the [B] debug token, but the  open `stopwatch` section ID
+                // is equal to the [A] debug token. Trying to reopen section with the [B] token throws an exception
+                // which must be caught.
+                try {
+                    $this->stopwatch->openSection($token);
+                } catch (\LogicException $e) {
+                }
+                break;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function postDispatch($eventName, Event $event)
+    {
+        switch ($eventName) {
+            case KernelEvents::CONTROLLER:
+                $this->stopwatch->start('controller', 'section');
+                break;
+            case KernelEvents::RESPONSE:
+                $token = $event->getResponse()->headers->get('X-Debug-Token');
+                $this->stopwatch->stopSection($token);
+                break;
+            case KernelEvents::TERMINATE:
+                // In the special case described in the `preDispatch` method above, the `$token` section
+                // does not exist, then closing it throws an exception which must be caught.
+                $token = $event->getResponse()->headers->get('X-Debug-Token');
+                try {
+                    $this->stopwatch->stopSection($token);
+                } catch (\LogicException $e) {
+                }
+                break;
+        }
+    }
+}