Create ImportDeclarations for default imports.

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 02f8869c419fc4c70504c2ac87fa1cf8fe3e7ee3..7318448497b9ea28598205ff40e5cbc591de9d10 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -5219,7 +5219,10 @@ TEST(ModuleParsingInternals) {
                                         128 * 1024);
 
   static const char kSource[] =
-      "let x = 5; export { x as y }; import { q as z } from 'm.js';";
+      "let x = 5;"
+      "export { x as y };"
+      "import { q as z } from 'm.js';"
+      "import n from 'n.js'";
   i::Handle<i::String> source = factory->NewStringFromAsciiChecked(kSource);
   i::Handle<i::Script> script = factory->NewScript(source);
   i::CompilationInfoWithZone info(script);
@@ -5241,13 +5244,17 @@ TEST(ModuleParsingInternals) {
   }
   CHECK_EQ(1, num_exports);
   i::ZoneList<i::Declaration*>* declarations = func->scope()->declarations();
-  CHECK_EQ(2, declarations->length());
+  CHECK_EQ(3, declarations->length());
   CHECK(declarations->at(0)->proxy()->raw_name()->IsOneByteEqualTo("x"));
   i::ImportDeclaration* import_decl =
       declarations->at(1)->AsImportDeclaration();
   CHECK(import_decl->import_name()->IsOneByteEqualTo("q"));
   CHECK(import_decl->proxy()->raw_name()->IsOneByteEqualTo("z"));
   CHECK(import_decl->module_specifier()->IsOneByteEqualTo("m.js"));
+  import_decl = declarations->at(2)->AsImportDeclaration();
+  CHECK(import_decl->import_name()->IsOneByteEqualTo("default"));
+  CHECK(import_decl->proxy()->raw_name()->IsOneByteEqualTo("n"));
+  CHECK(import_decl->module_specifier()->IsOneByteEqualTo("n.js"));
 }