[ES6 modules] Update ModuleScript::IsErrored to match latest spec.

This CL updates ModuleScript::IsErrored so that it would also consider
its record's [[Status]].

This behavior change will be tested in
wpt/html/semantics/scripting-1/the-script-element/module/evaluation-error-*.html
once we update ModuleTreeLinker to latest #internal-module-script-graph-fetching
procedure

Bug: 594639, 727299, whatwg/html#2674 , tc39/ecma262#916
Change-Id: I575001a44ca1cc2ad5c9208c93c0b628a09086dd
Reviewed-on: https://chromium-review.googlesource.com/558825
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#483945}

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

@@ -205,6 +205,19 @@ bool ModuleScript::HasInstantiated() const {
          status == ScriptModuleState::kEvaluated;
 }
 
+// https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-is-errored
+bool ModuleScript::IsErrored() const {
+  // "We say that a module script is errored ..." [spec text]
+
+  // "if either its module record is null, ..." [spec text]
+  if (record_.IsEmpty())
+    return true;
+
+  // "or its module record's [[Status]] field has the value "errored"." [spec
+  // text]
+  return RecordStatus() == ScriptModuleState::kErrored;
+}
+
 void ModuleScript::SetErrorAndClearRecord(ScriptValue error) {
   DVLOG(1) << *this << "::SetErrorAndClearRecord()";
 

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

@@ -68,7 +68,7 @@ class CORE_EXPORT ModuleScript final : public Script, public TraceWrapperBase {
   bool HasInstantiated() const;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-is-errored
-  bool IsErrored() const { return record_.IsEmpty(); }
+  bool IsErrored() const;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-set-pre-instantiation-error
   void SetErrorAndClearRecord(ScriptValue error);

third_party/WebKit/Source/core/loader/modulescript/ModuleTreeLinkerTest.cpp

@@ -189,16 +189,26 @@ class ModuleTreeLinkerTestModulator final : public DummyModulator {
     return it->value;
   }
 
-  ScriptValue InstantiateModule(ScriptModule) override {
+  ScriptValue InstantiateModule(ScriptModule record) override {
     if (instantiate_should_fail_) {
       ScriptState::Scope scope(script_state_.Get());
       v8::Local<v8::Value> error = V8ThrowException::CreateError(
           script_state_->GetIsolate(), "Instantiation failure.");
+      errored_records_.insert(record);
       return ScriptValue(script_state_.Get(), error);
     }
+    instantiated_records_.insert(record);
     return ScriptValue();
   }
 
+  ScriptModuleState GetRecordStatus(ScriptModule record) override {
+    if (instantiated_records_.Contains(record))
+      return ScriptModuleState::kInstantiated;
+    if (errored_records_.Contains(record))
+      return ScriptModuleState::kErrored;
+    return ScriptModuleState::kUninstantiated;
+  }
+
   ScriptValue GetError(const ModuleScript* module_script) override {
     ScriptState::Scope scope(script_state_.Get());
     return ScriptValue(script_state_.Get(), module_script->CreateErrorInternal(
@@ -224,6 +234,8 @@ class ModuleTreeLinkerTestModulator final : public DummyModulator {
   HeapHashMap<KURL, Member<ModuleScript>> module_map_;
   HeapHashMap<KURL, Member<ModuleTreeClient>> pending_tree_client_map_;
   HashMap<KURL, AncestorList> pending_tree_ancestor_list_;
+  HashSet<ScriptModule> instantiated_records_;
+  HashSet<ScriptModule> errored_records_;
   bool instantiate_should_fail_ = false;
 };