bindings: Don't throw a TypeError when 'null' is passed to nullable callback function

third_party/WebKit/Source/bindings/tests/results/modules/VoidCallbackFunctionModules.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!
 
 // This file has been generated from the Jinja2 template in
 // third_party/WebKit/Source/bindings/templates/callback_function.cpp.tmpl
 
 // clang-format off
 
 #include "VoidCallbackFunctionModules.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ToV8.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "core/dom/ExecutionContext.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
 
+// static
+VoidCallbackFunctionModules* VoidCallbackFunctionModules::create(ScriptState* scriptState, v8::Local<v8::Value> callback){
+  if (isUndefinedOrNull(callback))
+    return nullptr;
+  return new VoidCallbackFunctionModules(scriptState, v8::Local<v8::Function>::Cast(callback));
+}
+
 VoidCallbackFunctionModules::VoidCallbackFunctionModules(ScriptState* scriptState, v8::Local<v8::Function> callback)
     : m_scriptState(scriptState),
     m_callback(scriptState->isolate(), this, callback) {
   DCHECK(!m_callback.isEmpty());
 }
 
 DEFINE_TRACE(VoidCallbackFunctionModules) {}
 
 DEFINE_TRACE_WRAPPERS(VoidCallbackFunctionModules) {
   visitor->traceWrappers(m_callback.cast<v8::Value>());
@@ skipping 24 matching lines @@
   v8::TryCatch exceptionCatcher(m_scriptState->isolate());
   exceptionCatcher.SetVerbose(true);
 
   if (V8ScriptRunner::callFunction(m_callback.newLocal(m_scriptState->isolate()), m_scriptState->getExecutionContext(), thisValue, 0, argv, m_scriptState->isolate()).ToLocal(&v8ReturnValue)) {
     return true;
   }
   return false;
 }
 
 }  // namespace blink