MD Settings: label and describe a bunch of subpage/open-in-new buttons

chrome/browser/resources/settings/privacy_page/privacy_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_vars_css.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.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-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../clear_browsing_data_dialog/clear_browsing_data_dialog.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
@@ skipping 143 matching lines @@
               label="$i18n{spellingPref}"
               sub-label="$i18n{spellingDescription}">
           </settings-toggle-button>
         </div>
 </if>
 <if expr="use_nss_certs or is_win or is_macosx">
         <div id="manageCertificates" class="settings-box two-line"
             actionable on-tap="onManageCertificatesTap_">
           <div class="start">
             $i18n{manageCertificates}
-            <div class="secondary">$i18n{manageCertificatesDescription}</div>
+            <div class="secondary" id="manageCertificatesSecondary">
+              $i18n{manageCertificatesDescription}
+            </div>
           </div>
 <if expr="use_nss_certs">
-          <button is="paper-icon-button-light" class="subpage-arrow"></button>
+          <button is="paper-icon-button-light" class="subpage-arrow"
+              aria-label="$i18n{manageCertificates}"
+              aria-describedby="manageCertificatesSecondary"></button>
 </if>
 <if expr="not use_nss_certs">
-          <button is="paper-icon-button-light" class="icon-external"></button>
+          <button is="paper-icon-button-light" class="icon-external"
+              aria-label="$i18n{manageCertificates}"
+              aria-describedby="manageCertificatesSecondary"></button>
 </if>
         </div>
 </if>
         <div id="site-settings-subpage-trigger"
             class="settings-box two-line" actionable
             on-tap="onSiteSettingsTap_">
           <div class="start">
             [[siteSettingsPageTitle_()]]
-            <div class="secondary">$i18n{siteSettingsDescription}</div>
+            <div class="secondary" id="siteSettingsSecondary">
+              $i18n{siteSettingsDescription}
+            </div>
           </div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="[[siteSettingsPageTitle_()]]"
+              aria-describedby="siteSettingsSecondary"></button>
         </div>
         <div class="settings-box two-line" id="clearBrowsingData"
             on-tap="onClearBrowsingDataTap_" actionable>
           <div class="start">
             $i18n{clearBrowsingData}
-            <div class="secondary">$i18n{clearBrowsingDataDescription}</div>
+            <div class="secondary" id="clearBrowsingDataSecondary">
+              $i18n{clearBrowsingDataDescription}
+            </div>
           </div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{clearBrowsingData}"
+              aria-describedby="clearBrowsingDataSecondary"></button>
         </div>
       </neon-animatable>
 <if expr="use_nss_certs">
       <template is="dom-if" route-path="/certificates">
         <settings-subpage
             associated-control="[[$$('#manageCertificates')]]"
             page-title="$i18n{manageCertificates}">
           <settings-certificate-manager-page>
           </settings-certificate-manager-page>
         </settings-subpage>
@@ skipping 155 matching lines @@
         <settings-subpage page-title="$i18n{siteSettingsFlash}">
           <category-default-setting category="{{ContentSettingsTypes.PLUGINS}}"
               toggle-off-label="$i18n{siteSettingsFlashBlock}"
               toggle-on-label="$i18n{siteSettingsFlashAllow}"
               sub-option-label="$i18n{siteSettingsFlashAskBefore}"
               sub-option-secondary="$i18n{siteSettingsFlashAskBeforeSubtitle}">
           </category-default-setting>
 <if expr="chromeos">
           <div actionable class="settings-box"
               on-tap="onAdobeFlashStorageClicked_">
-            <div class="start">
-              $i18n{adobeFlashStorage}
-            </div>
-            <button class="icon-external" is="paper-icon-button-light"></button>
+            <div class="start">$i18n{adobeFlashStorage}</div>
+            <button class="icon-external" is="paper-icon-button-light"
+                aria-label="$i18n{adobeFlashStorage}"></button>
           </div>
 </if>
           <category-setting-exceptions
               category="{{ContentSettingsTypes.PLUGINS}}">
           </category-setting-exceptions>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/content/popups" no-search>
         <settings-subpage page-title="$i18n{siteSettingsCategoryPopups}">
           <category-default-setting category="{{ContentSettingsTypes.POPUPS}}"
@@ skipping 66 matching lines @@
                 category="{{ContentSettingsTypes.PROTECTED_CONTENT}}">
             </category-setting-exceptions>
           </template>
 </if>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="privacy_page.js"></script>
 </dom-module>