Assert destination handler exists in AudioParam

third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 86 matching lines @@
     : AbstractAudioContext(document, numberOfChannels, numberOfFrames, sampleRate)
     , m_isRenderingStarted(false)
     , m_totalRenderFrames(numberOfFrames)
 {
     // Create a new destination for offline rendering.
     m_renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
 
     // Throw an exception if the render target is not ready.
     if (m_renderTarget) {
         m_destinationNode = OfflineAudioDestinationNode::create(this, m_renderTarget.get());
+        initialize();
     } else {
         exceptionState.throwRangeError(ExceptionMessages::failedToConstruct(
             "OfflineAudioContext",
             "failed to create OfflineAudioContext(" +
             String::number(numberOfChannels) + ", " +
             String::number(numberOfFrames) + ", " +
             String::number(sampleRate) + ")"));
     }
-
-    initialize();
 }
 
 OfflineAudioContext::~OfflineAudioContext()
 {
 }
 
 DEFINE_TRACE(OfflineAudioContext)
 {
     visitor->trace(m_renderTarget);
     visitor->trace(m_completeResolver);
@@ skipping 286 matching lines @@
     // Note that the GraphLock is required before this check. Since this needs
     // to run on the audio thread, OfflineGraphAutoLocker must be used.
     if (m_scheduledSuspends.contains(currentSampleFrame()))
         return true;
 
     return false;
 }
 
 } // namespace blink