Add dummy dart:html library for documentation.

dartdoc will be added in the fake dart:html library in lib/html/doc
and merged into the real dart:html library during dart:html build.

We will be adding a tool to that can be run as part of the dart:html build to
merge in the documentation.  The tool will also be able to run stand-alone to
update the documentation post-build.  This will allow documentation work to
continue independently of building.

Review URL: https://chromiumcodereview.appspot.com//10544064

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@8415 260f80e4-7a28-3924-810f-c04153c831b5

lib/html/doc/interface/JavaScriptAudioNode.dartdoc

@@ -0,0 +1,24 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// WARNING:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName JavaScriptAudioNode
+interface JavaScriptAudioNode extends AudioNode, EventTarget {
+
+  /**
+   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
+   */
+  JavaScriptAudioNodeEvents get on();
+
+  /** @domName JavaScriptAudioNode.bufferSize */
+  final int bufferSize;
+}
+
+interface JavaScriptAudioNodeEvents extends Events {
+
+  EventListenerList get audioProcess();
+}