Safety check UI: add "unknown update status"

* For non-Google-based browsers, |VersionUpdater| returns a "updates
  disabled" state. Until now, safety check displayed this as a
  generic error.
* This CL adds a "unknown" updates status, which displays the current
  version of the browser in the safety check update status.
* This CL updates the JS side. The C++ side is updated in
  crrev.com/c/2144038.

Bug: 1015841
Change-Id: Ied9d8cc1b07ba6f12494b2e253a8f7f90e4f3375
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148778Reviewed-by: Andrey Zaytsev <andzaytsev@google.com>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759588}

chrome/browser/resources/settings/safety_check_page/safety_check_browser_proxy.js

@@ -39,6 +39,7 @@ cr.define('settings', function() {
     DISABLED_BY_ADMIN: 4,
     FAILED_OFFLINE: 5,
     FAILED: 6,
+    UNKNOWN: 7,
   };
 
   /**

chrome/browser/resources/settings/safety_check_page/safety_check_page.js

@@ -448,6 +448,7 @@ Polymer({
       case settings.SafetyCheckUpdatesStatus.RELAUNCH:
       case settings.SafetyCheckUpdatesStatus.DISABLED_BY_ADMIN:
       case settings.SafetyCheckUpdatesStatus.FAILED_OFFLINE:
+      case settings.SafetyCheckUpdatesStatus.UNKNOWN:
         return ChildUiStatus.INFO;
       case settings.SafetyCheckUpdatesStatus.FAILED:
         return ChildUiStatus.WARNING;

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

@@ -252,6 +252,14 @@ suite('SafetyCheckUiTests', function() {
     assertIconStatusWarning(page.$$('#updatesIcon'));
   });
 
+  test('updatesUnknownUiTest', function() {
+    fireSafetyCheckUpdatesEvent(settings.SafetyCheckUpdatesStatus.UNKNOWN);
+    Polymer.dom.flush();
+    assertFalse(!!page.$$('#safetyCheckUpdatesButton'));
+    assertFalse(!!page.$$('#safetyCheckUpdatesManagedIcon'));
+    assertIconStatusInfo(page.$$('#updatesIcon'));
+  });
+
   test('passwordsUiTest', function() {
     // Iterate over all states
     for (const state of Object.values(settings.SafetyCheckPasswordsStatus)) {