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

chrome/browser/resources/settings/about_page/about_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/lifetime_browser_proxy.html">
 <link rel="import" href="/route.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/settings_page_css.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 
 <if expr="chromeos">
 <link rel="import" href="/about_page/detailed_build_info.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 </if>
 
+<if expr="_google_chrome and is_macosx">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
+</if>
+
 <dom-module id="settings-about-page">
   <template>
     <style include="settings-shared settings-page-styles">
       :host {
         --about-page-image-space: 10px;
       }
 
       .copyable {
         -webkit-user-select: text;
       }
@@ skipping 27 matching lines @@
         padding-top: 10px;
       }
 
       .info-section {
         margin-bottom: 12px;
       }
 
       #regulatoryInfo img {
         width: 330px;
       }
+
+<if expr="_google_chrome and is_macosx">
+      #promoteUpdater[disabled] {
+        @apply(--settings-secondary);
+      }
+</if>
     </style>
     <div>
       <settings-section page-title="$i18n{aboutPageTitle}" section="about">
         <settings-animated-pages id="pages" section="about">
           <neon-animatable route-path="default">
             <div class="settings-box two-line">
               <img id="product-logo" on-tap="onProductLogoTap_"
                   srcset="chrome://theme/current-channel-logo@1x 1x,
                           chrome://theme/current-channel-logo@2x 2x" alt="">
               <span class="product-title">$i18n{aboutProductTitle}</span>
@@ skipping 39 matching lines @@
                   $i18n{aboutRelaunchAndPowerwash}
                 </paper-button>
                 <paper-button id="checkForUpdates" class="secondary-button"
                     hidden="[[!showCheckUpdates_]]"
                     on-tap="onCheckUpdatesTap_">
                   $i18n{aboutCheckForUpdates}
                 </paper-button>
 </if>
               </span>
             </div>
+<if expr="_google_chrome and is_macosx">
+            <template is="dom-if" if="[[!promoteUpdaterStatus_.hidden]]">
+              <div id="promoteUpdater" class="settings-box"
+                  disabled$="[[promoteUpdaterStatus_.disabled]]"
+                  actionable$="[[promoteUpdaterStatus_.actionable]]"
+                  on-tap="onPromoteUpdaterTap_">
+                <div class="start">
+                  [[promoteUpdaterStatus_.text]]
+                  <a href="https://support.google.com/chrome/answer/95414"
+                      target="_blank" id="updaterLearnMore"
+                      on-tap="onLearnMoreTap_">
+                    $i18n{learnMore}
+                  </a>
+                </div>
+                <button class="subpage-arrow" is="paper-icon-button-light"
+                    disabled="[[promoteUpdaterStatus_.disabled]]"
+                    hidden="[[!promoteUpdaterStatus_.actionable]]">
+                </button>
+              </div>
+            </template>
+</if>
             <div id="help" class="settings-box" on-tap="onHelpTap_" actionable>
               <div class="start">$i18n{aboutGetHelpUsingChrome}</div>
               <button class="icon-external" is="paper-icon-button-light">
               </button>
             </div>
 <if expr="_google_chrome">
             <div id="reportIssue" class="settings-box" actionable
                 on-tap="onReportIssueTap_">
               <div class="start">$i18n{aboutReportAnIssue}</div>
               <button class="subpage-arrow" is="paper-icon-button-light">
@@ skipping 37 matching lines @@
               <settings-detailed-build-info></settings-detailed-build-info>
             </settings-subpage>
           </template>
 </if>
         </settings-animated-pages>
       </settings-section>
     </div>
   </template>
   <script src="about_page.js"></script>
 </dom-module>