Move the exception logic to the AudioNode creator

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

Index: third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp b/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp
index 1579cf3c8c8aea2c4931518fb42913c45ab98da1..022a6b17ddf3c2d91bd1048f7fcb078edf3e97cd 100644
--- a/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp
@@ -122,8 +122,15 @@ MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AbstractAudioCo
     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);
 }