Re-gen SDK files and enable audio test onAudioProcess exists again

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 943 matching lines @@
 
 @DocsEditable()
 @DomName('ScriptProcessorNode')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#ScriptProcessorNode
 @Experimental()
 @Native("ScriptProcessorNode,JavaScriptAudioNode")
 class ScriptProcessorNode extends AudioNode {
   // To suppress missing implicit constructor warnings.
   factory ScriptProcessorNode._() { throw new UnsupportedError("Not supported"); }
 
+  /**
+   * Static factory designed to expose `audioprocess` events to event
+   * handlers that are not necessarily instances of [ScriptProcessorNode].
+   *
+   * See [EventStreamProvider] for usage information.
+   */
+  @DomName('ScriptProcessorNode.audioprocessEvent')
+  @DocsEditable()
+  @Experimental() // untriaged
+  static const EventStreamProvider<AudioProcessingEvent> audioProcessEvent = const EventStreamProvider<AudioProcessingEvent>('audioprocess');
+
   @DomName('ScriptProcessorNode.bufferSize')
   @DocsEditable()
   final int bufferSize;
 
   @DomName('ScriptProcessorNode.setEventListener')
   @DocsEditable()
   @Experimental() // untriaged
   void setEventListener(EventListener eventListener) native;
+
+  /// Stream of `audioprocess` events handled by this [ScriptProcessorNode].
+/**
+   * Get a Stream that fires events when AudioProcessingEvents occur.
+   * This particular stream is special in that it only allows one listener to a
+   * given stream. Converting the returned Stream [asBroadcast] will likely ruin
+   * the soft-real-time properties which which these events are fired and can
+   * be processed.
+   */
+  @DomName('ScriptProcessorNode.onaudioprocess')
+  @DocsEditable()
+  @Experimental() // untriaged
+  Stream<AudioProcessingEvent> get onAudioProcess => audioProcessEvent.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.
 
 
 @DocsEditable()
 @DomName('WaveShaperNode')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#dfn-WaveShaperNode
 @Experimental()
 @Native("WaveShaperNode")
 class WaveShaperNode extends AudioNode {
   // To suppress missing implicit constructor warnings.
   factory WaveShaperNode._() { throw new UnsupportedError("Not supported"); }
 
   @DomName('WaveShaperNode.curve')
   @DocsEditable()
   Float32List curve;
 
   @DomName('WaveShaperNode.oversample')
   @DocsEditable()
   String oversample;
 }