MD Settings: rework how advanced UI shows

chrome/browser/resources/settings/settings_ui/settings_ui.html

Index: chrome/browser/resources/settings/settings_ui/settings_ui.html
diff --git a/chrome/browser/resources/settings/settings_ui/settings_ui.html b/chrome/browser/resources/settings/settings_ui/settings_ui.html
index 5cea906f0fe2705d9344bcf389f54f1146a7e98a..dc46a2d8380589ec57e53a9dfda9571b13aaa8ee 100644
--- a/chrome/browser/resources/settings/settings_ui/settings_ui.html
+++ b/chrome/browser/resources/settings/settings_ui/settings_ui.html
@@ -95,7 +95,8 @@
       <div class="drawer-content">
         <template is="dom-if" id="drawerTemplate">
           <settings-menu page-visibility="[[pageVisibility_]]"
-              on-iron-activate="onIronActivate_">
+              on-iron-activate="onIronActivate_"
+              advanced-opened="{{advancedOpened_}}">
           </settings-menu>
         </template>
       </div>
@@ -103,7 +104,8 @@
     <paper-header-panel mode="waterfall">
       <settings-main prefs="{{prefs}}"
           toolbar-spinner-active="{{toolbarSpinnerActive_}}"
-          page-visibility="[[pageVisibility_]]">
+          page-visibility="[[pageVisibility_]]"
+          advanced-toggle-expanded="{{advancedOpened_}}">
       </settings-main>
     </paper-header-panel>
   </template>