Turn on webaudio for JS backends.

client/dom/generated/src/interface/AudioNode.dart

Index: client/dom/generated/src/interface/AudioNode.dart
diff --git a/client/dom/generated/src/interface/AudioNode.dart b/client/dom/generated/src/interface/AudioNode.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d29c3b53b34b0d231c06893cdd95617e88fb14c2
--- /dev/null
+++ b/client/dom/generated/src/interface/AudioNode.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2011, 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: Do not edit - generated code.
+
+interface AudioNode {
+
+  AudioContext get context();
+
+  int get numberOfInputs();
+
+  int get numberOfOutputs();
+
+  void connect(AudioNode destination, [int output, int input]);
+
+  void disconnect([int output]);
+}