MD Settings: Lazy create fonts page

chrome/browser/resources/settings/appearance_page/appearance_page.html

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 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
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 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://md-settings/controls/settings_input.html">
 <link rel="import" href="chrome://md-settings/controls/settings_radio_group.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
@@ skipping 75 matching lines @@
           <div class="start" i18n-content="pageZoom"></div>
           <settings-dropdown-menu id="pageZoom"
               pref="{{prefs.partition.default_zoom_level}}"
               menu-options="[[pageZoomOptions_]]">
           </settings-dropdown-menu>
         </div>
       </neon-animatable>
       <neon-animatable id="appearance-fonts">
         <settings-subheader i18n-values="page-title:customizeFonts">
         </settings-subheader>
-        <settings-appearance-fonts-page prefs="{{prefs}}">
-        </settings-appearance-fonts-page>
+        <template is="dom-if" if="[[showFontsPage_(currentRoute.subpage.*)]]"
+            restamp>
+          <settings-appearance-fonts-page prefs="{{prefs}}">
+          </settings-appearance-fonts-page>
+        </template>
       </neon-animatable>
     </settings-animated-pages>
   </template>
   <script src="appearance_page.js"></script>
 </dom-module>