Try to enable all webidls (#573)

* Try to enable all webidls

* Separate out unavailable webidl files by reason.

* Create record of fully tested WebIDL files

* Update notes to reflect new situation with web-idl

* Make a blank ident fail, disable the necessary widls.

It turns out that all the blank idents came from blank enum variants,
which is allowed in webidl apparently.

crates/web-sys/webidls/enabled/Fetch.webidl

@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://fetch.spec.whatwg.org/
+ */
+
+typedef object JSON;
+typedef (Blob or BufferSource or FormData or URLSearchParams or USVString) BodyInit;
+
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface Body {
+  readonly attribute boolean bodyUsed;
+  [Throws]
+  Promise<ArrayBuffer> arrayBuffer();
+  [Throws]
+  Promise<Blob> blob();
+  [Throws]
+  Promise<FormData> formData();
+  [Throws]
+  Promise<JSON> json();
+  [Throws]
+  Promise<USVString> text();
+};
+
+// These are helper dictionaries for the parsing of a
+// getReader().read().then(data) parsing.
+// See more about how these 2 helpers are used in
+// dom/fetch/FetchStreamReader.cpp
+dictionary FetchReadableStreamReadDataDone {
+  boolean done = false;
+};
+
+dictionary FetchReadableStreamReadDataArray {
+  Uint8Array value;
+};