[ES6 modules] Implement #concept-module-script-instantiation-error

third_party/WebKit/Source/core/dom/ModuleScript.cpp

 // Copyright 2017 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.
 
 #include "core/dom/ModuleScript.h"
 
 namespace blink {
 
+void ModuleScript::setInstantiationError(v8::Isolate* isolate,
+                                         v8::Local<v8::Value> error) {
+  DCHECK_EQ(m_instantiationState, ModuleInstantiationState::Uninstantiated);
+  m_instantiationState = ModuleInstantiationState::Errored;
+
+  DCHECK(!error.IsEmpty());
+  m_instantiationError.set(isolate, error);
+}
+
+void ModuleScript::setInstantiationSuccess() {
+  DCHECK_EQ(m_instantiationState, ModuleInstantiationState::Uninstantiated);
+  m_instantiationState = ModuleInstantiationState::Instantiated;
+}
+
 DEFINE_TRACE(ModuleScript) {}
+DEFINE_TRACE_WRAPPERS(ModuleScript) {
+  visitor->traceWrappers(m_instantiationError);
+}
 
 }  // namespace blink