LibWeb+WebContent: Add plumbing for 'webdriver-active flag'

Author: https://github.com/linusg
Commit: 3f24a444f9
Pull-request: https://github.com/SerenityOS/serenity/pull/15559
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/AtkinsSJ

Userland/Services/WebContent/PageHost.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -70,6 +71,11 @@ void PageHost::set_is_scripting_enabled(bool is_scripting_enabled)
     page().set_is_scripting_enabled(is_scripting_enabled);
 }
 
+void PageHost::set_is_webdriver_active(bool is_webdriver_active)
+{
+    page().set_is_webdriver_active(is_webdriver_active);
+}
+
 Web::Layout::InitialContainingBlock* PageHost::layout_root()
 {
     auto* document = page().top_level_browsing_context().active_document();