Merge 91802 - V8 custom bindings for AudioNode must do proper object checking and throw exception...

Source/WebCore/bindings/v8/custom/V8AudioNodeCustom.cpp

 /*
  * Copyright (C) 2010, 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 23 matching lines @@
 #include "V8Binding.h"
 #include "V8Proxy.h"
 
 namespace WebCore {
 
 v8::Handle<v8::Value> V8AudioNode::connectCallback(const v8::Arguments& args)
 {    
     if (args.Length() < 1)
         return throwError("Not enough arguments", V8Proxy::SyntaxError);
 
-    AudioNode* destinationNode = toNative(args[0]->ToObject());
+    AudioNode* destinationNode = 0;
+    if (V8AudioNode::HasInstance(args[0]))
+        destinationNode = toNative(args[0]->ToObject());
+        
     if (!destinationNode)
         return throwError("Invalid destination node", V8Proxy::SyntaxError);
     
     unsigned output = 0;
     unsigned input = 0;
     bool ok = false;
     if (args.Length() > 1) {
         output = toInt32(args[1], ok);
         if (!ok)
             return throwError("Invalid index parameters", V8Proxy::SyntaxError);
@@ skipping 27 matching lines @@
     bool success = audioNode->disconnect(output);
     if (!success)
         return throwError("Invalid index parameter", V8Proxy::SyntaxError);
 
     return v8::Undefined();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)