[SecurityBundle] Add trust_resolver variable into expression

| Q             | A
| ------------- | ---
| Bug fix?      | [yes]
| New feature?  | [no]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| Fixed tickets | [#12224]
| License       | MIT
| Doc PR        | [-]

src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php

@@ -619,7 +619,7 @@ private function createExpression($container, $expression)
             ->register($id, 'Symfony\Component\ExpressionLanguage\SerializedParsedExpression')
             ->setPublic(false)
             ->addArgument($expression)
-            ->addArgument(serialize($this->getExpressionLanguage()->parse($expression, array('token', 'user', 'object', 'roles', 'request'))->getNodes()))
+            ->addArgument(serialize($this->getExpressionLanguage()->parse($expression, array('token', 'user', 'object', 'roles', 'request', 'trust_resolver'))->getNodes()))
         ;
 
         return $this->expressions[$id] = new Reference($id);