One more permission used by DocumentsUI.

    <!-- @hide Allows an application to cache content.

         <p>Not for use by third-party applications.

         <p>Protection level: signature

    -->

    <permission android:name="android.permission.CACHE_CONTENT"

        android:protectionLevel="signature" />

        android:protectionLevel="signature|documenter" />

    <!-- @SystemApi @hide

         Allows an application to aggressively allocate disk space.