IDL: Add missing type-check for callback function arguments

Source/bindings/tests/results/core/V8TestInterface.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #if ENABLE(CONDITION)
 #include "V8TestInterface.h"
 
@@ skipping 1522 matching lines @@
 #if ENABLE(PARTIAL_CONDITION)
 static void partialVoidMethodPartialCallbackTypeArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "partialVoidMethodPartialCallbackTypeArg", "TestInterface", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestInterfaceImplementation* impl = V8TestInterface::toImpl(info.Holder());
     ScriptValue partialCallbackTypeArg;
     {
+        if (!info[0]->IsFunction()) {
+            V8ThrowException::throwTypeError(info.GetIsolate(), ExceptionMessages::failedToExecute("partialVoidMethodPartialCallbackTypeArg", "TestInterface", "The callback provided as parameter 1 is not a function."));
+            return;
+        }
         partialCallbackTypeArg = ScriptValue(ScriptState::current(info.GetIsolate()), info[0]);
     }
     TestPartialInterface::partialVoidMethodPartialCallbackTypeArg(*impl, partialCallbackTypeArg);
 }
 #endif // ENABLE(PARTIAL_CONDITION)
 
 #if ENABLE(PARTIAL_CONDITION)
 static void partialVoidMethodPartialCallbackTypeArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
@@ skipping 821 matching lines @@
 void V8TestInterface::registerPartial2VoidMethodMethodForPartialInterface(void (*method)(const v8::FunctionCallbackInfo<v8::Value>&))
 {
     TestInterfaceImplementationV8Internal::partial2VoidMethodMethodForPartialInterface = method;
 }
 void V8TestInterface::registerPartial2StaticVoidMethodMethodForPartialInterface(void (*method)(const v8::FunctionCallbackInfo<v8::Value>&))
 {
     TestInterfaceImplementationV8Internal::partial2StaticVoidMethodMethodForPartialInterface = method;
 }
 } // namespace blink
 #endif // ENABLE(CONDITION)