MD Settings: add a semi-functional System page

chrome/browser/resources/settings/advanced_page/advanced_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://md-settings/downloads_page/downloads_page.html">
 <link rel="import" href="chrome://md-settings/languages_page/languages_page.html">
 <link rel="import" href="chrome://md-settings/passwords_and_forms_page/passwords_and_forms_page.html">
 <link rel="import" href="chrome://md-settings/privacy_page/privacy_page.html">
 <link rel="import" href="chrome://md-settings/reset_page/reset_page.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_page_visibility.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_section.html">
 <link rel="import" href="chrome://md-settings/site_settings/constants.html">
 <link rel="import" href="chrome://md-settings/site_settings/site_settings_category.html">
 
 <if expr="chromeos">
 <link rel="import" href="chrome://md-settings/a11y_page/a11y_page.html">
 <link rel="import" href="chrome://md-settings/bluetooth_page/bluetooth_page.html">
 <link rel="import" href="chrome://md-settings/date_time_page/date_time_page.html">
 </if>
 
+<if expr="not chromeos">
+<link rel="import" href="chrome://md-settings/system_page/system_page.html">
+<link rel="import" href="chrome://md-settings/system_page/system_page_delegate.html">
+</if>
+
 <dom-module id="settings-advanced-page">
   <link rel="import" type="css" href="chrome://md-settings/settings_page.css">
   <template>
 <if expr="chromeos">
     <template is="dom-if" if="[[showPage(pageVisibility.dateTime)]]" restamp>
       <settings-section page-title="[[i18n('dateTimePageTitle')]]"
           current-route="[[currentRoute]]" section="dateTime">
         <settings-date-time-page prefs="{{prefs}}">
         </settings-date-time-page>
       </settings-section>
@@ skipping 51 matching lines @@
 <if expr="chromeos">
     <!-- TODO(dbeam): find somewhere to stuff "Add more accessibility features"
          on desktop. -->
     <template is="dom-if" if="[[showPage(pageVisibility.a11y)]]" restamp>
       <settings-section page-title="[[i18n('a11yPageTitle')]]"
           current-route="[[currentRoute]]" section="a11y">
         <settings-a11y-page prefs="{{prefs}}"></settings-a11y-page>
       </settings-section>
     </template>
 </if>
+<if expr="not chromeos">
+    <template is="dom-if" if="[[showPage(pageVisibility.system)]]" restamp>
+      <settings-section page-title="[[i18n('systemPageTitle')]]"
+          current-route="[[currentRoute]]" section="system">
+        <settings-system-page prefs="{{prefs}}"></settings-system-page>
+      </settings-section>
+    </template>
+</if>
   </template>
   <script src="chrome://md-settings/advanced_page/advanced_page.js"></script>
 </dom-module>