Added constructor for AudioContext for dartc and frog

client/dom/scripts/template_interface_AudioContext.darttemplate

Index: client/dom/scripts/template_interface_AudioContext.darttemplate
diff --git a/client/dom/scripts/template_interface_AudioContext.darttemplate b/client/dom/scripts/template_interface_AudioContext.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..0328579c2aa8e4566d40239a8062d228ff0a30d0
--- /dev/null
+++ b/client/dom/scripts/template_interface_AudioContext.darttemplate
@@ -0,0 +1,10 @@
+// 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 AudioContext$!EXTENDS factory _AudioContextFactoryProvider {
+
+  AudioContext();
+$!MEMBERS}