According to ReadDirectoryChangesW documentation, this parameter is
perfectly valid and its absence in current enumeration makes it incomplete.

Internal flags like FILE_NOTIFY_CHANGE_EA were not added.

Change-Id: I9d4182dcfa67e67289c0cc35155a64bf5e5152db
Reviewed-on: https://go-review.googlesource.com/6560Reviewed-by: Alex Brainman <alex.brainman@gmail.com>