Turn on webaudio for JS backends.

client/dom/generated/src/frog/AudioListener.dart

Index: client/dom/generated/src/frog/AudioListener.dart
diff --git a/client/dom/generated/src/frog/AudioListener.dart b/client/dom/generated/src/frog/AudioListener.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5032b7a904a52076dafcbcbcd07801f56e1ac8ac
--- /dev/null
+++ b/client/dom/generated/src/frog/AudioListener.dart
@@ -0,0 +1,17 @@
+
+class AudioListener native "*AudioListener" {
+
+  num dopplerFactor;
+
+  num speedOfSound;
+
+  void setOrientation(num x, num y, num z, num xUp, num yUp, num zUp) native;
+
+  void setPosition(num x, num y, num z) native;
+
+  void setVelocity(num x, num y, num z) native;
+
+  var dartObjectLocalStorage;
+
+  String get typeName() native;
+}