Add webkitAudioPannerNode as an optional name

tests/html/audiocontext_test.dart

Index: tests/html/audiocontext_test.dart
diff --git a/tests/html/audiocontext_test.dart b/tests/html/audiocontext_test.dart
index 318332b69e962b6c60f74db7ad0c3fc564d43afd..68c2af9a9fdade2d3b71fbf0c6b56ea036c7a418 100644
--- a/tests/html/audiocontext_test.dart
+++ b/tests/html/audiocontext_test.dart
@@ -20,17 +20,20 @@ main() {
   });
 
   group('functional', () {
+    var context;

[terry, 2015/01/23 19:58:09]

This doesn't need to be broken out?  Assumed this was done for debugging?

[Alan Knight, 2015/01/23 20:15:01]

When I made too many different tests you started getting errors about audio
resources being unavailable, so I think there are limits and it's better to just
allocate one.

+    if (AudioContext.supported) {
+      context = new AudioContext();
+    }
+    
     test('constructorTest', () {
       if(AudioContext.supported) {
-        var ctx = new AudioContext();
-        expect(ctx, isNotNull);
-        expect(ctx, isAudioContext);
+        expect(context, isNotNull);
+        expect(context, isAudioContext);
       }
     });
 
     test('audioRenames', () {
       if(AudioContext.supported) {
-        AudioContext context = new AudioContext();
         GainNode gainNode = context.createGain();
         gainNode.connectNode(context.destination);
         expect(gainNode is GainNode, isTrue);
@@ -67,7 +70,6 @@ main() {
 
     test('oscillatorTypes', () {
       if(AudioContext.supported) {
-        AudioContext context = new AudioContext();
         OscillatorNode oscillator = context.createOscillator();
         oscillator.connectNode(context.destination);