/usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Unity/Action/qmldir is in qtdeclarative5-unity-action-plugin 1.1.0+14.04.20140304-0ubuntu2~gcc5.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | module Ubuntu.Unity.Action
plugin unity-action-qml
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