Add mac-only "Set Up Automatic Updates..." button to the new about page.

chrome/browser/resources/settings/about_page/about_page_browser_proxy.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.
 
 /**
  * @fileoverview A helper object used from the "About" section to interact with
  * the browser.
  */
 
 <if expr="chromeos">
@@ skipping 42 matching lines @@
 var UpdateStatus = {
   CHECKING: 'checking',
   UPDATING: 'updating',
   NEARLY_UPDATED: 'nearly_updated',
   UPDATED: 'updated',
   FAILED: 'failed',
   DISABLED: 'disabled',
   DISABLED_BY_ADMIN: 'disabled_by_admin',
 };
 
+<if expr="_google_chrome and is_macosx">
+/**
+ * @typedef {{
+ *   hidden: boolean,
+ *   disabled: boolean,
+ *   actionable: boolean,
+ *   text: (string|undefined)
+ * }}
+ */
+var PromoteUpdaterStatus;
+</if>
+
 /**
  * @typedef {{
  *   status: !UpdateStatus,
  *   progress: (number|undefined),
  *   message: (string|undefined),
  * }}
  */
 var UpdateStatusChangedEvent;
 
 cr.define('settings', function() {
@@ skipping 68 matching lines @@
 
     /** @return {!Promise<!ChannelInfo>} */
     getChannelInfo: function() {},
 
     /** @return {!Promise<!VersionInfo>} */
     getVersionInfo: function() {},
 
     /** @return {!Promise<?RegulatoryInfo>} */
     getRegulatoryInfo: function() {},
 </if>
+
+<if expr="_google_chrome and is_macosx">
+    /**
+     * Triggers setting up auto-updates for all users.
+     */
+    promoteUpdater: function() {},
+</if>
   };
 
   /**
    * @implements {settings.AboutPageBrowserProxy}
    * @constructor
    */
   function AboutPageBrowserProxyImpl() {}
   cr.addSingletonGetter(AboutPageBrowserProxyImpl);
 
   AboutPageBrowserProxyImpl.prototype = {
     /** @override */
     pageReady: function() {
       chrome.send('aboutPageReady');
     },
 
     /** @override */
     refreshUpdateStatus: function() {
       chrome.send('refreshUpdateStatus');
     },
 
+<if expr="_google_chrome and is_macosx">
+    /** @override */
+    promoteUpdater: function() {
+      chrome.send('promoteUpdater');
+    },
+</if>
+
     /** @override */
     openHelpPage: function() {
       chrome.send('openHelpPage');
     },
 
 <if expr="_google_chrome">
     /** @override */
     openFeedbackDialog: function() {
       chrome.send('openFeedbackDialog');
     },
@@ skipping 27 matching lines @@
 </if>
   };
 
   return {
     AboutPageBrowserProxy: AboutPageBrowserProxy,
     AboutPageBrowserProxyImpl: AboutPageBrowserProxyImpl,
     browserChannelToI18nId: browserChannelToI18nId,
     isTargetChannelMoreStable: isTargetChannelMoreStable,
   };
 });