Move the exception logic to the AudioNode creator

third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.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 104 matching lines @@
 }
 
 // ----------------------------------------------------------------
 
 MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AbstractAudioContext& context, size_t numberOfChannels)
     : AudioBasicInspectorNode(context)
 {
     setHandler(MediaStreamAudioDestinationHandler::create(*this, numberOfChannels));
 }
 
-MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AbstractAudioContext& context, size_t numberOfChannels)
+MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AbstractAudioContext& context, size_t numberOfChannels, ExceptionState& exceptionState)
 {
+    ASSERT(isMainThread());

[hongchan, 2016/05/13 01:20:12]

DCHECK.

[Raymond Toy, 2016/05/20 23:12:00]

Done.

+
+    if (context.isContextClosed()) {
+        context.throwExceptionForClosedState(exceptionState);
+        return nullptr;
+    }
+
     return new MediaStreamAudioDestinationNode(context, numberOfChannels);
 }
 
 MediaStream* MediaStreamAudioDestinationNode::stream() const
 {
     return static_cast<MediaStreamAudioDestinationHandler&>(handler()).stream();
 }
 
 } // namespace blink