MD Settings: Fix case where "Check for updates" is accidentally shown.

chrome/test/data/webui/settings/about_page_tests.js

 // 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.
 
 cr.define('settings_about_page', function() {
   /**
    * @constructor
    * @implements {settings.AboutPageBrowserProxy}
    * @extends {settings.TestBrowserProxy}
    */
@@ skipping 362 matching lines @@
             assertTrue(page.$.buttonContainer.hidden);
           }
 
           // Check that |UPDATED| status is ignored if the user has not
           // explicitly checked for updates yet.
           fireStatusChanged(UpdateStatus.UPDATED);
           assertFalse(checkForUpdates.hidden);
           assertTrue(relaunch.hidden);
           assertTrue(relaunchAndPowerwash.hidden);
 
+          // Check that the "Check for updates" button gets hidden for certain
+          // UpdateStatus values, even if the CHECKING state was never
+          // encountered (for example triggering update from crosh command
+          // line).
+          fireStatusChanged(UpdateStatus.UPDATING);
+          assertAllHidden();
+          fireStatusChanged(UpdateStatus.NEARLY_UPDATED);
+          assertTrue(checkForUpdates.hidden);
+          assertFalse(relaunch.hidden);
+          assertTrue(relaunchAndPowerwash.hidden);
+
           fireStatusChanged(UpdateStatus.CHECKING);
           assertAllHidden();
 
           fireStatusChanged(UpdateStatus.UPDATING);
           assertAllHidden();
 
           fireStatusChanged(UpdateStatus.NEARLY_UPDATED);
           assertTrue(checkForUpdates.hidden);
           assertFalse(relaunch.hidden);
           assertTrue(relaunchAndPowerwash.hidden);
@@ skipping 447 matching lines @@
     registerTests: function() {
       if (cr.isChromeOS) {
         registerDetailedBuildInfoTests();
         registerChannelSwitcherDialogTests();
       }
       registerAboutPageTests();
     },
     registerOfficialBuildTests: registerOfficialBuildTests,
   };
 });