/usr/lib/x86_64-linux-gnu/qt5/qml/QtWebEngine/Controls1Delegates/qmldir is in qml-module-qtwebengine 5.9.5+dfsg-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | module QtWebEngine.Controls1Delegates
AlertDialog 1.0 AlertDialog.qml
ConfirmDialog 1.0 ConfirmDialog.qml
FilePicker 1.0 FilePicker.qml
PromptDialog 1.0 PromptDialog.qml
Menu 1.0 Menu.qml
MenuItem 1.0 MenuItem.qml
MenuSeparator 1.0 MenuSeparator.qml
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