[ESNext] Implement DynamicImportCall

src/runtime/runtime-module.cc

Index: src/runtime/runtime-module.cc
diff --git a/src/runtime/runtime-module.cc b/src/runtime/runtime-module.cc
index f36a09b410bf00a8658882f021f0918bd6aff2c3..4e858d224a9f9d526867105c73c0bef8c5a5bc6e 100644
--- a/src/runtime/runtime-module.cc
+++ b/src/runtime/runtime-module.cc
@@ -13,9 +13,16 @@ namespace internal {
 
 RUNTIME_FUNCTION(Runtime_DynamicImportCall) {
   HandleScope scope(isolate);
-  DCHECK_EQ(1, args.length());
-  // TODO(gsathya): Implement ImportCall.
-  return isolate->heap()->undefined_value();
+  DCHECK_EQ(2, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(String, source_url, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, specifier, 1);
+  Handle<String> specifier_str;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, specifier_str,
+                                     Object::ToString(isolate, specifier));
+  Handle<JSPromise> promise = isolate->factory()->NewJSPromise();
+  isolate->RunHostImportModuleDynamicallyCallback(source_url, specifier_str,
+                                                  promise);
+  return *promise;
 }
 
 RUNTIME_FUNCTION(Runtime_GetModuleNamespace) {