/usr/include/unity/ is in libunity-api-dev 8.7+17.04.20170404-0ubuntu1.
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..
/usr/include/unity/Exception.h
/usr/include/unity/SymbolExport.h
/usr/include/unity/UnityExceptions.h
/usr/include/unity/api/
/usr/include/unity/api/Version.h
/usr/include/unity/shell/
/usr/include/unity/shell/application/
/usr/include/unity/shell/application/ApplicationInfoInterface.h
/usr/include/unity/shell/application/ApplicationManagerInterface.h
/usr/include/unity/shell/application/Mir.h
/usr/include/unity/shell/application/MirMousePointerInterface.h
/usr/include/unity/shell/application/MirPlatformCursor.h
/usr/include/unity/shell/application/MirSurfaceInterface.h
/usr/include/unity/shell/application/MirSurfaceItemInterface.h
/usr/include/unity/shell/application/MirSurfaceListInterface.h
/usr/include/unity/shell/application/SurfaceManagerInterface.h
/usr/include/unity/shell/launcher/
/usr/include/unity/shell/launcher/AppDrawerModelInterface.h
/usr/include/unity/shell/launcher/LauncherItemInterface.h
/usr/include/unity/shell/launcher/LauncherModelInterface.h
/usr/include/unity/shell/launcher/QuickListModelInterface.h
/usr/include/unity/shell/notifications/
/usr/include/unity/shell/notifications/Enums.h
/usr/include/unity/shell/notifications/ModelInterface.h
/usr/include/unity/shell/notifications/NotificationInterface.h
/usr/include/unity/shell/notifications/SourceInterface.h
/usr/include/unity/shell/scopes/
/usr/include/unity/shell/scopes/CategoriesInterface.h
/usr/include/unity/shell/scopes/ExpandableFilterWidgetInterface.h
/usr/include/unity/shell/scopes/FilterBaseInterface.h
/usr/include/unity/shell/scopes/FiltersInterface.h
/usr/include/unity/shell/scopes/NavigationInterface.h
/usr/include/unity/shell/scopes/OptionSelectorFilterInterface.h
/usr/include/unity/shell/scopes/OptionSelectorOptionsInterface.h
/usr/include/unity/shell/scopes/PreviewModelInterface.h
/usr/include/unity/shell/scopes/PreviewWidgetModelInterface.h
/usr/include/unity/shell/scopes/RangeInputFilterInterface.h
/usr/include/unity/shell/scopes/ResultsModelInterface.h
/usr/include/unity/shell/scopes/ScopeInterface.h
/usr/include/unity/shell/scopes/ScopesInterface.h
/usr/include/unity/shell/scopes/SettingsModelInterface.h
/usr/include/unity/shell/scopes/ValueSliderFilterInterface.h
/usr/include/unity/shell/scopes/ValueSliderValuesInterface.h
/usr/include/unity/util/
/usr/include/unity/util/Daemon.h
/usr/include/unity/util/DefinesPtrs.h
/usr/include/unity/util/FileIO.h
/usr/include/unity/util/GObjectMemory.h
/usr/include/unity/util/GioMemory.h
/usr/include/unity/util/GlibMemory.h
/usr/include/unity/util/IniParser.h
/usr/include/unity/util/NonCopyable.h
/usr/include/unity/util/ResourcePtr.h
/usr/include/unity/util/SnapPath.h