[ES6 modules] Rethrow instantiation error when attempt to resolve instantiation failed module.

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

Index: third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.cpp
diff --git a/third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.cpp b/third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.cpp
index e74a2c9fd55ed051c2827a76759e2f951e01505f..b5d90c0b2ac7e1467030fc7b26059ddbe86be4f4 100644
--- a/third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.cpp
+++ b/third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.cpp
@@ -68,21 +68,20 @@ ScriptModule ScriptModuleResolverImpl::Resolve(
   // throw resolved module script's instantiation error.
   if (module_script->InstantiationState() ==
       ModuleInstantiationState::kErrored) {
-    // TODO(kouhei): Implement this path once
-    // https://codereview.chromium.org/2782403002/ landed.
-    NOTIMPLEMENTED();
+    ScriptValue error = modulator_->GetInstantiationError(module_script);
+    exception_state.RethrowV8Exception(error.V8Value());
     return ScriptModule();
   }
 
   // Step 6. Assert: resolved module script's instantiation state is
   // "instantiated" (and thus its module record is not null).
-  // TODO(kouhei): Enable below check once once
-  // https://codereview.chromium.org/2782403002/ landed.
-  // CHECK_EQ(moduleScript->instantiationState(),
-  // ModuleInstantiationState::Instantiated);
+  CHECK_EQ(module_script->InstantiationState(),
+           ModuleInstantiationState::kInstantiated);
+  ScriptModule record = module_script->Record();
+  CHECK(!record.IsNull());
 
   // Step 7. Return resolved module script's module record.
-  return module_script->Record();
+  return record;
 }
 
 DEFINE_TRACE(ScriptModuleResolverImpl) {