MD Settings: move appeal into flow to unhide Advanced toggle

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

 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-header-panel/paper-header-panel.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="/direction_delegate.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/settings_main/settings_main.html">
 <link rel="import" href="/settings_menu/settings_menu.html">
 <link rel="import" href="/settings_page/settings_router.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-ui">
   <template>
     <style include="settings-shared">
+      /* TODO(dbeam): remove appeal before launch. */
+      #appeal {
+        align-items: center;
+        background: rgb(123, 170, 247);
+        display: flex;
+      }
+
+      #request {
+        flex: 1;
+        font-size: .8125rem;
+        font-weight: bold;
+        padding: 8px 24px;
+      }
+
+      #request h1 {
+        font-size: 1rem;
+        margin: 0;
+      }
+
+      #request a {
+        color: rgb(100, 100, 255);
+      }
+
+      #close {
+        padding: 20px;
+      }
+
       :host {
         @apply(--layout-fit);
         -webkit-user-select: none;
         background-color: var(--settings-background-color);
         display: flex;
         flex-direction: column;
       }
 
       paper-header-panel {
         --paper-header-panel-shadow: {
           z-index: 2;
         };
+        flex: 1;
       }
 
       .heading {
         -webkit-margin-start: 8px;
       }
 
       .paper-header {
         -webkit-padding-start: 24px;
         align-items: center;
         border-bottom: var(--settings-separator-line);
@@ skipping 57 matching lines @@
       <div class="drawer-header">$i18n{settings}</div>
       <div class="drawer-content">
         <settings-menu current-route="{{currentRoute}}" id="sideNav">
         </settings-menu>
       </div>
     </app-drawer>
     <paper-header-panel mode="waterfall">
       <settings-main prefs="{{prefs}}" current-route="{{currentRoute}}">
       </settings-main>
     </paper-header-panel>
+
+    <!-- TODO(dbeam): remove before launch. -->
+    <div id="appeal" hidden="[[appealClosed_]]">
+      <span id="request">
+        <h1>Please read: A personal appeal from the Chrome settings team.</h1>
+        <a href="https://goo.gl/btju6c">Please file bugs</a>
+        before you
+        <a href="chrome://settings-frame">go back to the old settings</a>.
+      </span>
+      <span id="close" tabindex=0 on-tap="onCloseAppealTap_">&#x2715;</span>
+    </div>
+
   </template>
   <script src="settings_ui.js"></script>
 </dom-module>