Make length property return useful values for DOM bindings functions

Source/bindings/v8/V8DOMConfiguration.h

 /*
  * 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
@@ skipping 84 matching lines @@
         int value;
     };
 
     static void batchConfigureConstants(v8::Handle<v8::FunctionTemplate>, v8::Handle<v8::ObjectTemplate>, const BatchedConstant*, size_t constantCount, v8::Isolate*);
 
     // BatchedMethod translates into calls to Set() on the prototype ObjectTemplate.
     struct BatchedMethod {
         const char* const name;
         v8::InvocationCallback callback;
         v8::InvocationCallback callbackForMainWorld;
+        int length;
     };
 
     static void batchConfigureCallbacks(v8::Handle<v8::ObjectTemplate>, v8::Handle<v8::Signature>, v8::PropertyAttribute, const BatchedMethod*, size_t callbackCount, v8::Isolate*, WrapperWorldType);
 
     static v8::Local<v8::Signature> configureTemplate(v8::Persistent<v8::FunctionTemplate>, const char* interfaceName, v8::Persistent<v8::FunctionTemplate> parentClass, size_t fieldCount, const BatchedAttribute*, size_t attributeCount, const BatchedMethod*, size_t callbackCount, v8::Isolate*, WrapperWorldType);
 };
 
 } // namespace WebCore
 
 #endif // V8DOMConfiguration_h