Add helper functions for throwing arity-related TypeErrors

Source/bindings/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
@@ skipping 50 matching lines @@
 
 // Schedule a JavaScript error to be thrown.
 v8::Handle<v8::Value> throwError(V8ErrorType, const String&, v8::Isolate*);
 
 // Schedule a JavaScript error to be thrown.
 v8::Handle<v8::Value> throwError(v8::Handle<v8::Value>, v8::Isolate*);
 
 // A helper for throwing JavaScript TypeError.
 v8::Handle<v8::Value> throwTypeError(const String&, v8::Isolate*);
 
+// Helpers for throwing JavaScript TypeErrors for arity mismatches.
+void throwArityTypeErrorForMethod(const char* method, const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams, v8::Isolate*);
+void throwArityTypeErrorForConstructor(const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams, v8::Isolate*);
+void throwArityTypeError(ExceptionState&, unsigned expected, unsigned providedLeastNumMandatoryParams);
+
 v8::ArrayBuffer::Allocator* v8ArrayBufferAllocator();
 
 inline v8::Handle<v8::Value> argumentOrNull(const v8::FunctionCallbackInfo<v8::Value>& info, int index)
 {
     return index >= info.Length() ? v8::Local<v8::Value>() : info[index];
 }
 
 template<typename CallbackInfo, typename V>
 inline void v8SetReturnValue(const CallbackInfo& info, V v)
 {
@@ skipping 676 matching lines @@
     v8::HandleScope m_handleScope;
     v8::Handle<v8::Context> m_context;
     v8::Context::Scope m_contextScope;
     RefPtr<DOMWrapperWorld> m_world;
     OwnPtr<V8PerContextData> m_perContextData;
 };
 
 } // namespace WebCore
 
 #endif // V8Binding_h