Add hooks to allow lock screen app pages in sign-in profile

chrome/test/data/extensions/lock_screen_apps/app_launch/test.js

Index: chrome/test/data/extensions/lock_screen_apps/app_launch/test.js
diff --git a/chrome/test/data/extensions/lock_screen_apps/app_launch/test.js b/chrome/test/data/extensions/lock_screen_apps/app_launch/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..ddec9769f5c7694ca664872adcb57cb4eab0d3f3
--- /dev/null
+++ b/chrome/test/data/extensions/lock_screen_apps/app_launch/test.js
@@ -0,0 +1,39 @@
+// Copyright 2017 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 noAccessToIdentity() {
+    chrome.test.assertTrue(!chrome.identity);
+    chrome.test.succeed();
+  },
+
+  function hasAccessToCurrentWindow() {
+    chrome.test.assertTrue(!!chrome.app.window.current);
+    chrome.test.assertTrue(!!chrome.app.window.current());
+    chrome.test.assertTrue(chrome.app.window.current().isMaximized());
+    chrome.test.succeed();
+  },
+
+  function cannotCreateSecondWindow() {
+    chrome.app.window.create('test.html', {
+      lockScreenAction: 'new_note'
+    }, chrome.test.callbackFail('Failed to create the app window.'));
+  },
+
+  function reportReadyToClose() {
+    // Notify the test runner the app window is ready to be closed - if the test
+    // runner replies with 'close', close the current app window. Otherwise, the
+    // test runner will close the window itself.
+    // NOTE: Reporting the test success should not wait for this - the test
+    //     runner should be notified of test run success before responding to
+    //     this message to avoid test done message being disregarded due to app
+    //     window clusure.
+    chrome.test.sendMessage('readyToClose', function(response) {
+      if (response === 'close')
+        chrome.app.window.current().close();
+    });
+
+    chrome.test.succeed();
+  },
+]);