[modules] Implement namespace imports.

test/mjsunit/modules-namespace3.js

Index: test/mjsunit/modules-namespace3.js
diff --git a/test/mjsunit/modules-namespace3.js b/test/mjsunit/modules-namespace3.js
new file mode 100644
index 0000000000000000000000000000000000000000..df9ef7806bc740cecb3ecf4652a8268dbdacd171
--- /dev/null
+++ b/test/mjsunit/modules-namespace3.js
@@ -0,0 +1,11 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// MODULE
+
+import * as foo from "modules-namespace3.js";
+export * from "modules-namespace3.js";
+export var bar;
+assertEquals(["bar", "default"], Object.getOwnPropertyNames(foo));
+export default function() {};