MD Settings: Tune searching algorithm to skip certain subpages.

chrome/browser/resources/settings/a11y_page/a11y_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <if expr="chromeos">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="/a11y_page/manage_a11y_page.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 </if>
 
 <dom-module id="settings-a11y-page">
   <template>
     <style include="settings-shared"></style>
 <if expr="chromeos">
     <settings-animated-pages id="pages" current-route="{{currentRoute}}"
         section="a11y">
       <neon-animatable id="main">
         <div class="settings-box first">
           <div class="start">
             $i18n{optionsInMenuLabel}
           </div>
           <paper-toggle-button id="optionsInMenuToggle"
               checked="{{prefs.settings.a11y.enable_menu.value}}">
           </paper-toggle-button>
         </div>
-        <div class="settings-box">
+        <div id="subpage-trigger" class="settings-box">
           <paper-button class="primary-button"
               on-tap="onManageAccessibilityFeaturesTap_">
             $i18n{manageAccessibilityFeatures}
           </paper-button>
         </div>
       </neon-animatable>
       <template is="dom-if" name="manage-a11y">
-        <settings-subpage page-title="$i18n{manageAccessibilityFeatures}">
+        <settings-subpage
+            associated-control="[[$$('#subpage-trigger')]]"
+            page-title="$i18n{manageAccessibilityFeatures}">
           <settings-manage-a11y-page prefs="{{prefs}}">
           </settings-manage-a11y-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
 </if>
 
 <if expr="not chromeos">
     <div class="settings-box first">
       <paper-button class="primary-button" on-tap="onMoreFeaturesTap_">
         $i18n{moreFeaturesLink}
       </paper-button>
     </div>
 </if>
 
   </template>
   <script src="a11y_page.js"></script>
 </dom-module>