/usr/share/gtk-doc/ is in libcairo2-doc 1.14.0-2.1+deb8u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/cairo/
/usr/share/gtk-doc/html/cairo/bindings-errors.html
/usr/share/gtk-doc/html/cairo/bindings-fonts.html
/usr/share/gtk-doc/html/cairo/bindings-memory.html
/usr/share/gtk-doc/html/cairo/bindings-overloading.html
/usr/share/gtk-doc/html/cairo/bindings-path.html
/usr/share/gtk-doc/html/cairo/bindings-patterns.html
/usr/share/gtk-doc/html/cairo/bindings-return-values.html
/usr/share/gtk-doc/html/cairo/bindings-streams.html
/usr/share/gtk-doc/html/cairo/bindings-surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Error-handling.html
/usr/share/gtk-doc/html/cairo/cairo-FreeType-Fonts.html
/usr/share/gtk-doc/html/cairo/cairo-Image-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-PDF-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-PNG-Support.html
/usr/share/gtk-doc/html/cairo/cairo-Paths.html
/usr/share/gtk-doc/html/cairo/cairo-PostScript-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Quartz-(CGFont)-Fonts.html
/usr/share/gtk-doc/html/cairo/cairo-Quartz-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Raster-Sources.html
/usr/share/gtk-doc/html/cairo/cairo-Recording-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Regions.html
/usr/share/gtk-doc/html/cairo/cairo-SVG-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Script-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-Transformations.html
/usr/share/gtk-doc/html/cairo/cairo-Types.html
/usr/share/gtk-doc/html/cairo/cairo-User-Fonts.html
/usr/share/gtk-doc/html/cairo/cairo-Version-Information.html
/usr/share/gtk-doc/html/cairo/cairo-Win32-Fonts.html
/usr/share/gtk-doc/html/cairo/cairo-Win32-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-XCB-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-XLib-Surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-XLib-XRender-Backend.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-device-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-font-face-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-font-options-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-matrix-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-pattern-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-scaled-font-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-surface-t.html
/usr/share/gtk-doc/html/cairo/cairo-cairo-t.html
/usr/share/gtk-doc/html/cairo/cairo-drawing.html
/usr/share/gtk-doc/html/cairo/cairo-fonts.html
/usr/share/gtk-doc/html/cairo/cairo-support.html
/usr/share/gtk-doc/html/cairo/cairo-surfaces.html
/usr/share/gtk-doc/html/cairo/cairo-text.html
/usr/share/gtk-doc/html/cairo/cairo.devhelp2
/usr/share/gtk-doc/html/cairo/home.png
/usr/share/gtk-doc/html/cairo/index-1.10.html
/usr/share/gtk-doc/html/cairo/index-1.12.html
/usr/share/gtk-doc/html/cairo/index-1.2.html
/usr/share/gtk-doc/html/cairo/index-1.4.html
/usr/share/gtk-doc/html/cairo/index-1.6.html
/usr/share/gtk-doc/html/cairo/index-1.8.html
/usr/share/gtk-doc/html/cairo/index-all.html
/usr/share/gtk-doc/html/cairo/index.html
/usr/share/gtk-doc/html/cairo/index.sgml
/usr/share/gtk-doc/html/cairo/language-bindings.html
/usr/share/gtk-doc/html/cairo/left.png
/usr/share/gtk-doc/html/cairo/right.png
/usr/share/gtk-doc/html/cairo/style.css
/usr/share/gtk-doc/html/cairo/up.png