Changes

Finally, since the fullscreen needs the harness, the harness will provide the special powers. So please do '''NOT add any special powers''' in your child files.

# Proper IDL documentation for navigator.pointer (see example in https://mxr.mozilla.org/mozilla-central/source/dom/interfaces/html/nsIDOMHTMLElement.idl#103), MouseLockable and its methods, MouseLockLost event, etc.