File API automated IDL tests

      interface ArrayBuffer {
      };

      interface ArrayBufferView {
      };

      interface URL {
      };

      interface EventTarget {
      };

      interface Event {
      };

      [TreatNonCallableAsNull]
      callback EventHandlerNonNull = any (Event event);
      typedef EventHandlerNonNull? EventHandler;
    

      interface FileList {
        getter File? item(unsigned long index);
        readonly attribute unsigned long length;
      };

      [Constructor,
       Constructor(sequence<(ArrayBuffer or ArrayBufferView or Blob or DOMString)> blobParts, optional BlobPropertyBag options)]
      interface Blob {
        readonly attribute unsigned long long size;
        readonly attribute DOMString type;

        //slice Blob into byte-ranged chunks

        Blob slice(optional long long start,
                   optional long long end,
                   optional DOMString contentType);
        void close();
      };

      dictionary BlobPropertyBag {
        DOMString type = "";
      };

      [Constructor(Blob fileBits, DOMString fileName)]
      interface File : Blob {
        readonly attribute DOMString name;
        readonly attribute Date lastModifiedDate;
      };

      [Constructor]
      interface FileReader: EventTarget {
        // async read methods
        void readAsArrayBuffer(Blob blob);
        void readAsText(Blob blob, optional DOMString label);
        void readAsDataURL(Blob blob);

        void abort();

        // states
        const unsigned short EMPTY = 0;
        const unsigned short LOADING = 1;
        const unsigned short DONE = 2;

        readonly attribute unsigned short readyState;

        // File or Blob data
        readonly attribute (DOMString or ArrayBuffer)? result;

        readonly attribute DOMError? error;

        // event handler attributes
        attribute EventHandler onloadstart;
        attribute EventHandler onprogress;
        attribute EventHandler onload;
        attribute EventHandler onabort;
        attribute EventHandler onerror;
        attribute EventHandler onloadend;
      };

      partial interface URL {
        static DOMString? createObjectURL(Blob blob);
        static DOMString? createFor(Blob blob); // static DOMString? createFor()Blob blob);
        static void revokeObjectURL(DOMString url);
      };