/usr/lib/x86_64-linux-gnu/unity8/qml/Unity/qmldir is in unity-plugin-scopes 0.5.7+16.04.20160317-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | module Unity
plugin Unity-qml
typeinfo plugin.qmltypes
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