LibWeb: Add OOPWV IPC for retrieving selected text

Author: https://github.com/trflynn89
Commit: 2fda6ce159
Pull-request: https://github.com/SerenityOS/serenity/pull/8740

Userland/Libraries/LibWeb/OutOfProcessWebView.cpp

@@ -412,4 +412,9 @@ void OutOfProcessWebView::js_console_input(const String& js_source)
     client().async_js_console_input(js_source);
 }
 
+String OutOfProcessWebView::selected_text()
+{
+    return client().get_selected_text();
+}
+
 }