Turn on webaudio for JS backends.

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

Index: client/dom/generated/src/frog/AudioParam.dart
diff --git a/client/dom/generated/src/frog/AudioParam.dart b/client/dom/generated/src/frog/AudioParam.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ffc6f3afc6fd8881ce7b4170436400cb0ec51f09
--- /dev/null
+++ b/client/dom/generated/src/frog/AudioParam.dart
@@ -0,0 +1,31 @@
+
+class AudioParam native "*AudioParam" {
+
+  num defaultValue;
+
+  num maxValue;
+
+  num minValue;
+
+  String name;
+
+  int units;
+
+  num value;
+
+  void cancelScheduledValues(num startTime) native;
+
+  void exponentialRampToValueAtTime(num value, num time) native;
+
+  void linearRampToValueAtTime(num value, num time) native;
+
+  void setTargetValueAtTime(num targetValue, num time, num timeConstant) native;
+
+  void setValueAtTime(num value, num time) native;
+
+  void setValueCurveAtTime(Float32Array values, num time, num duration) native;
+
+  var dartObjectLocalStorage;
+
+  String get typeName() native;
+}