LibWeb: Add in all of the plumbing required to use the JS console over IPC

Author: https://github.com/xeons
Commit: 0682af7b65
Pull-request: https://github.com/SerenityOS/serenity/pull/5556

Userland/Libraries/LibWeb/WebViewHooks.h

@@ -47,6 +47,7 @@ public:
     Function<void(const URL&)> on_url_drop;
     Function<void(DOM::Document*)> on_set_document;
     Function<void(const URL&, const String&)> on_get_source;
+    Function<void(const String& method, const String& line)> on_js_console_output;
 };
 
 }