Sync worker interfaces with the HTML spec

Source/core/workers/WorkerGlobalScope.idl

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
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  * modification, are permitted provided that the following conditions
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  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+// https://html.spec.whatwg.org/#the-workerglobalscope-common-interface
+
 [
     Exposed=Worker,
 ] interface WorkerGlobalScope : EventTarget {
-
-    // WorkerGlobalScope
     readonly attribute WorkerGlobalScope self;
     readonly attribute WorkerLocation location;
+
     void close();
+    // TODO(philipj): onerror should be an OnErrorEventHandler.
     attribute EventHandler onerror;
-    [Replaceable] readonly attribute WorkerConsole console;
+    // attribute EventHandler onlanguagechange;
+    // attribute EventHandler onoffline;
+    // attribute EventHandler ononline;
 
-
-    // WorkerUtils
+    // https://html.spec.whatwg.org/#apis-available-to-workers
     [RaisesException] void importScripts(DOMString... urls);
     readonly attribute WorkerNavigator navigator;
+
+    // Console API (non-standard but widely implemented in some form)
+    // https://developer.chrome.com/devtools/docs/console-api
+    [Replaceable] readonly attribute WorkerConsole console;
 };
 
 WorkerGlobalScope implements WindowBase64;
 WorkerGlobalScope implements WindowTimers;