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/PageTransitionEvent.webidl

@@ -0,0 +1,32 @@
+/* -*- 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 PageTransitionEvent interface is used for the pageshow and
+ * pagehide events, which are generic events that apply to both page
+ * load/unload and saving/restoring a document from session history.
+ */
+
+[Constructor(DOMString type, optional PageTransitionEventInit eventInitDict)]
+interface PageTransitionEvent : Event
+{
+  /**
+   * Set to true if the document has been or will be persisted across
+   * firing of the event.  For example, if a document is being cached in
+   * session history, |persisted| is true for the PageHide event.
+   */
+  readonly attribute boolean persisted;
+
+  // Whether the document is in the middle of a frame swap.
+  [ChromeOnly]
+  readonly attribute boolean inFrameSwap;
+};
+
+dictionary PageTransitionEventInit : EventInit
+{
+  boolean persisted = false;
+  boolean inFrameSwap = false;
+};