Fix for bug 14923

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

 /**
  * High-fidelity audio programming in the browser.
  */
 library dart.dom.web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
@@ skipping 343 matching lines @@
 
   @DomName('AudioContext.createWaveShaper')
   @DocsEditable()
   WaveShaperNode createWaveShaper() native;
 
   @JSName('decodeAudioData')
   @DomName('AudioContext.decodeAudioData')
   @DocsEditable()
   void _decodeAudioData(ByteBuffer audioData, AudioBufferCallback successCallback, [AudioBufferCallback errorCallback]) native;
 
-  @JSName('decodeAudioData')
-  @DomName('AudioContext.decodeAudioData')
-  @DocsEditable()
-  Future<AudioBuffer> decodeAudioData(ByteBuffer audioData) {
-    var completer = new Completer<AudioBuffer>();
-    _decodeAudioData(audioData,
-        (value) { completer.complete(value); },
-        (error) { completer.completeError(error); });
-    return completer.future;
-  }
-
   @DomName('AudioContext.startRendering')
   @DocsEditable()
   void startRendering() native;
 
   /// Stream of `complete` events handled by this [AudioContext].
   @DomName('AudioContext.oncomplete')
   @DocsEditable()
   Stream<Event> get onComplete => completeEvent.forTarget(this);
 
   factory AudioContext() => JS('AudioContext',
@@ skipping 15 matching lines @@
       return JS('ScriptProcessorNode', '#.call(#, #, #, #)', function, this,
           bufferSize, numberOfInputChannels, numberOfOutputChannels);
     } else if (numberOfInputChannels != null) {
       return JS('ScriptProcessorNode', '#.call(#, #, #)', function, this,
           bufferSize, numberOfInputChannels);
     } else {
       return JS('ScriptProcessorNode', '#.call(#, #)', function, this,
           bufferSize);
     }
   }
+  @DomName('AudioContext.decodeAudioData')
+  Future<AudioBuffer> decodeAudioData(ByteBuffer audioData) {
+    var completer = new Completer<AudioBuffer>();
+    _decodeAudioData(audioData,
+        (value) { completer.complete(value); },
+        (error) {
+          if (error == null) {
+            completer.completeError('');
+          } else {
+            completer.completeError(error);
+          }
+        });
+    return completer.future;
+  }
 }
 // Copyright (c) 2012, 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.
 
 
 @DocsEditable()
 @DomName('AudioDestinationNode')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioDestinationNode-section
 @Experimental()
@@ skipping 673 matching lines @@
   factory WaveShaperNode._() { throw new UnsupportedError("Not supported"); }
 
   @DomName('WaveShaperNode.curve')
   @DocsEditable()
   Float32List curve;
 
   @DomName('WaveShaperNode.oversample')
   @DocsEditable()
   String oversample;
 }