[ES6 modules] Return previous error when an instantiation is reattempt.

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

 // 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.
 
 #ifndef ModuleScript_h
 #define ModuleScript_h
 
 #include "bindings/core/v8/ScriptModule.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
@@ skipping 31 matching lines @@
   }
   ~ModuleScript() override = default;
 
   const ScriptModule& Record() const { return record_; }
   const KURL& BaseURL() const { return base_url_; }
 
   ModuleInstantiationState InstantiationState() const {
     return instantiation_state_;
   }
 
-  v8::Local<v8::Value> CreateInstantiationError(v8::Isolate* isolate) const {
-    return instantiation_error_.NewLocal(isolate);
-  }
-
   // Implements Step 7.1 of:
   // https://html.spec.whatwg.org/multipage/webappapis.html#internal-module-script-graph-fetching-procedure
   void SetInstantiationErrorAndClearRecord(ScriptValue error);
   // Implements Step 7.2 of:
   // https://html.spec.whatwg.org/multipage/webappapis.html#internal-module-script-graph-fetching-procedure
   void SetInstantiationSuccess();
 
   ParserDisposition ParserState() const { return parser_state_; }
   WebURLRequest::FetchCredentialsMode CredentialsMode() const {
     return credentials_mode_;
@@ skipping 18 matching lines @@
         parser_state_(parser_state),
         credentials_mode_(credentials_mode) {}
 
   ScriptType GetScriptType() const override { return ScriptType::kModule; }
   bool IsEmpty() const override;
   bool CheckMIMETypeBeforeRunScript(Document* context_document,
                                     const SecurityOrigin*) const override;
   void RunScript(LocalFrame*, const SecurityOrigin*) const override;
   String InlineSourceTextForCSP() const override;
 
+  friend class ModulatorImpl;
+  friend class ModuleTreeLinkerTestModulator;
+  // Access this func only via ModulatorImpl::GetInstantiationError(),
+  // or via Modulator mocks for unit tests.
+  v8::Local<v8::Value> CreateInstantiationErrorInternal(
+      v8::Isolate* isolate) const {
+    return instantiation_error_.NewLocal(isolate);
+  }
+
   // https://html.spec.whatwg.org/multipage/webappapis.html#settings-object
   Member<Modulator> settings_object_;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-module-record
   ScriptModule record_;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-base-url
   const KURL base_url_;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-instantiation-state
@@ skipping 16 matching lines @@
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-parser
   const ParserDisposition parser_state_;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-credentials-mode
   const WebURLRequest::FetchCredentialsMode credentials_mode_;
 };
 
 }  // namespace blink
 
 #endif