Turn on webaudio for JS backends.

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

Index: client/dom/generated/src/frog/BiquadFilterNode.dart
diff --git a/client/dom/generated/src/frog/BiquadFilterNode.dart b/client/dom/generated/src/frog/BiquadFilterNode.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b8f785cee9e5686154947a8cf0b8e157a79768f7
--- /dev/null
+++ b/client/dom/generated/src/frog/BiquadFilterNode.dart
@@ -0,0 +1,27 @@
+
+class BiquadFilterNode extends AudioNode native "*BiquadFilterNode" {
+
+  static final int ALLPASS = 7;
+
+  static final int BANDPASS = 2;
+
+  static final int HIGHPASS = 1;
+
+  static final int HIGHSHELF = 4;
+
+  static final int LOWPASS = 0;
+
+  static final int LOWSHELF = 3;
+
+  static final int NOTCH = 6;
+
+  static final int PEAKING = 5;
+
+  AudioParam Q;
+
+  AudioParam frequency;
+
+  AudioParam gain;
+
+  int type;
+}