Implement AudioScheduledSourceNode

third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// See https://webaudio.github.io/web-audio-api/#ConstantSourceNode
+// See https://webaudio.github.io/web-audio-api/
 [
-    Constructor(BaseAudioContext context, optional ConstantSourceOptions options),
-    RaisesException=Constructor,
     ActiveScriptWrappable,
+    DependentLifetime
 ]
-interface ConstantSourceNode : AudioSourceNode {
-    readonly attribute AudioParam offset;
+interface AudioScheduledSourceNode : AudioNode {
     [RaisesException] void start(optional double when);
     [RaisesException] void stop(optional double when);
     attribute EventHandler onended;
 };