MAGETWO-58796: Add request parameter to CMS event observer

Author: Sergey Semenov

app/code/Magento/Theme/Test/Unit/Controller/Adminhtml/System/Design/Theme/IndexTest.php

@@ -18,7 +18,9 @@ public function testIndexAction()
         $menuModel = $this->getMock(
             \Magento\Backend\Model\Menu::class,
             [],
-            [$this->getMock(\Psr\Log\LoggerInterface::class)]
+            [$this->getMock(\Psr\Log\LoggerInterface::class)],
+            '',
+            false
         );
         $menuModel->expects($this->once())
             ->method('getParentItems')