Enhance the controller resolver to get a route match class

+++ b/core/lib/Drupal/Core/Controller/ControllerResolver.php
@@ -136,7 +137,29 @@ protected function createController($controller) {
+      } elseif ($param->getClass() && ($param->getClass()->name == 'Drupal\Core\Routing\RouteMatchInterface' || is_subclass_of($param->getClass()->name, 'Drupal\Core\Routing\RouteMatchInterface'))) {
+        $arguments[] = RouteMatch::createFromRequest($request);

This is the only part being added, correct?

Also, this block should be using Drupal coding standards if it's in one of our classes.

How much of a use case does this have? The most common thing to inject is a parameter, which is already handled. The next most common would be query parameters, but I don't believe that's handled by RouteMatch, is it?

How often are we doing that? The patch doesn't show it as a common thing here.

(Sorry, just trying to avoid loading more features than we need to into something that we could very easily add post-8.0.0.)

There are still places we use the request to get the _raw_variables, they could use this.
Bumping to critical as its part of a critical meta.

+++ b/core/modules/rest/src/RequestHandler.php
@@ -87,7 +90,7 @@ public function handle(Request $request) {
-    $format = $request->attributes->get(RouteObjectInterface::ROUTE_OBJECT)->getRequirement('_format') ?: 'json';
+    $format = $route_match->getRouteObject()->getRequirement('_format') ?: 'json';

Much nicer.

I think this is a welcome improvement. RTBC if it still passes.

Committed 86922ac and pushed to 8.0.x. Thanks!

diff --git a/core/lib/Drupal/Core/Controller/DialogController.php b/core/lib/Drupal/Core/Controller/DialogController.php
index 575b41a..48279e5 100644
--- a/core/lib/Drupal/Core/Controller/DialogController.php
+++ b/core/lib/Drupal/Core/Controller/DialogController.php
@@ -10,9 +10,7 @@
 use Drupal\Core\Ajax\AjaxResponse;
 use Drupal\Core\Ajax\OpenDialogCommand;
 use Drupal\Core\Page\HtmlPage;
-use Drupal\Core\Routing\RouteMatch;
 use Drupal\Core\Routing\RouteMatchInterface;
-use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -53,6 +51,8 @@ public function __construct(ControllerResolverInterface $controller_resolver, Ti
    *
    * @param \Symfony\Component\HttpFoundation\Request $request
    *   The request object.
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match.
    * @param mixed $_content
    *   A controller definition string, or a callable object/closure.
    *
diff --git a/core/modules/rest/src/RequestHandler.php b/core/modules/rest/src/RequestHandler.php
index 505337c..c31600d 100644
--- a/core/modules/rest/src/RequestHandler.php
+++ b/core/modules/rest/src/RequestHandler.php
@@ -8,7 +8,6 @@
 namespace Drupal\rest;
 
 use Drupal\Core\Routing\RouteMatchInterface;
-use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 use Symfony\Component\HttpFoundation\Request;
diff --git a/core/modules/user/src/Controller/UserController.php b/core/modules/user/src/Controller/UserController.php
index 739a365..be1b03d 100644
--- a/core/modules/user/src/Controller/UserController.php
+++ b/core/modules/user/src/Controller/UserController.php
@@ -10,7 +10,6 @@
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\user\UserInterface;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Drupal\Core\Datetime\DateFormatter;
@@ -132,9 +131,6 @@ public function resetPass($uid, $timestamp, $hash) {
    * Displays user profile if user is logged in, or login form for anonymous
    * users.
    *
-   * @param \Symfony\Component\HttpFoundation\Request $request
-   *   The current request.
-   *
    * @return \Symfony\Component\HttpFoundation\RedirectResponse|array
    *   Returns either a redirect to the user page or the render
    *   array of the login form.
diff --git a/core/modules/views/src/Routing/ViewPageController.php b/core/modules/views/src/Routing/ViewPageController.php
index 2eec5b5..0bfa9a1 100644
--- a/core/modules/views/src/Routing/ViewPageController.php
+++ b/core/modules/views/src/Routing/ViewPageController.php
@@ -12,7 +12,6 @@
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\views\ViewExecutableFactory;
-use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

Fixed on commit