Enable fetching of admin policies for login screen apps

chrome/test/data/extensions/signin_screen_managed_storage/test.js

Index: chrome/test/data/extensions/signin_screen_managed_storage/test.js
diff --git a/chrome/test/data/extensions/signin_screen_managed_storage/test.js b/chrome/test/data/extensions/signin_screen_managed_storage/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..3da1eabf8ff1dd66842f5a8634dd45708ce63177
--- /dev/null
+++ b/chrome/test/data/extensions/signin_screen_managed_storage/test.js
@@ -0,0 +1,14 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+chrome.test.runTests([
+  function getPolicy() {
+    chrome.storage.managed.get(
+        'string-policy',
+        chrome.test.callbackPass(function(results) {
+          chrome.test.assertEq({
+            'string-policy': 'value'
+          }, results);
+        }));
+  }]);