MD Settings: Lazy-load sub-pages.

chrome/browser/resources/settings/languages_page/languages_page.html

 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.html">
+<link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.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-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.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-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://md-settings/settings_page/settings_animated_pages.html">
-<link rel="import" href="chrome://md-settings/settings_page/settings_subheader.html">
+<link rel="import" href="chrome://md-settings/settings_page/settings_subpage.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="language_detail_page.html">
 <link rel="import" href="languages.html">
 <link rel="import" href="manage_languages_page.html">
 
 <if expr="not is_macosx">
 <link rel="import" href="edit_dictionary_page.html">
 </if>
 
 <dom-module id="settings-languages-page">
@@ skipping 84 matching lines @@
                     >[[item.language.displayName]]</paper-checkbox>
               </template>
             </div>
             <div class="list-item list-button" i18n-content="manageSpellCheck"
                 on-tap="onEditDictionaryTap_">
             </div>
           </div>
         </iron-collapse>
 </if>
       </neon-animatable>
-      <neon-animatable id="manage-languages">
-        <settings-subheader i18n-values="page-title:manageLanguagesPageTitle">
-        </settings-subheader>
-        <settings-manage-languages-page
-            prefs="{{prefs}}"></settings-manage-languages-page>
-      </neon-animatable>
-      <neon-animatable id="language-detail">
-        <settings-subheader id="language-detail-subheader"
+      <template is="dom-if" name="manage-languages">
+        <settings-subpage page-title="[[i18n('manageLanguagesPageTitle')]]">
+          <settings-manage-languages-page
+              prefs="{{prefs}}"></settings-manage-languages-page>
+        </settings-subpage>
+      </template>
+      <template is="dom-if" name="language-detail">
+        <settings-subpage
             page-title="[[detailLanguage.language.displayName]]">
-        </settings-subheader>
-        <settings-language-detail-page id="languageDetailPage"
-            prefs="{{prefs}}" detail="[[detailLanguage]]">
-        </settings-language-detail-page>
-      </neon-animatable>
+          <settings-language-detail-page id="languageDetailPage"
+              prefs="{{prefs}}" detail="[[detailLanguage]]">
+          </settings-language-detail-page>
+        </settings-subpage>
+      </template>
 <if expr="not is_macosx">
-      <neon-animatable id="edit-dictionary">
-        <settings-subheader id="edit-dictionary-subheader"
-            i18n-values="page-title:editDictionaryPageTitle">
-        </settings-subheader>
-        <settings-edit-dictionary-page></settings-edit-dictionary-page>
-      </neon-animatable>
+      <template is="dom-if" name="edit-dictionary">
+        <settings-subpage page-title="[[i18n('editDictionaryPageTitle')]]">
+          <settings-edit-dictionary-page></settings-edit-dictionary-page>
+        </settings-subpage>
+      </template>
 </if>
     </settings-animated-pages>
   </template>
   <script src="languages_page.js"></script>
 </dom-module>