Update supported browser annotations for Firefox Web Audio.

sdk/lib/web_audio/dartium/web_audio_dartium.dart

 library dart.dom.web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 import 'dart:typed_data';
 import 'dart:_blink' as _blink;
@@ skipping 147 matching lines @@
 typedef void AudioBufferCallback(AudioBuffer audioBuffer);
 // 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.
 
 // WARNING: Do not edit - generated code.
 
 
 @DocsEditable()
 @DomName('AudioBufferSourceNode')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.FIREFOX)
+@Experimental()
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioBufferSourceNode-section
-@Experimental()
 class AudioBufferSourceNode extends AudioSourceNode {
   // To suppress missing implicit constructor warnings.
   factory AudioBufferSourceNode._() { throw new UnsupportedError("Not supported"); }
 
   /**
    * Static factory designed to expose `ended` events to event
    * handlers that are not necessarily instances of [AudioBufferSourceNode].
    *
    * See [EventStreamProvider] for usage information.
    */
@@ skipping 76 matching lines @@
   @Experimental() // untriaged
   Stream<Event> get onEnded => endedEvent.forTarget(this);
 
 }
 // 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.
 
 
 @DomName('AudioContext')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.FIREFOX)
+@Experimental()
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioContext-section
-@Experimental()
 class AudioContext extends EventTarget {
   // To suppress missing implicit constructor warnings.
   factory AudioContext._() { throw new UnsupportedError("Not supported"); }
 
   /**
    * Static factory designed to expose `complete` events to event
    * handlers that are not necessarily instances of [AudioContext].
    *
    * See [EventStreamProvider] for usage information.
    */
@@ skipping 935 matching lines @@
 
   @DomName('WaveShaperNode.oversample')
   @DocsEditable()
   String get oversample => _blink.BlinkWaveShaperNode.$oversample_Getter(this);
 
   @DomName('WaveShaperNode.oversample')
   @DocsEditable()
   void set oversample(String value) => _blink.BlinkWaveShaperNode.$oversample_Setter(this, value);
 
 }