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

chrome/browser/resources/settings/device_page/device_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.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-light.html">
 <link rel="import" href="device_page_browser_proxy.html">
 <link rel="import" href="display.html">
 <link rel="import" href="keyboard.html">
 <link rel="import" href="pointers.html">
 <link rel="import" href="storage.html">
 <link rel="import" href="stylus.html">
 <link rel="import" href="../prefs/prefs.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_page/settings_animated_pages.html">
 <link rel="import" href="../settings_page/settings_subpage.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-device-page">
   <template>
     <style include="settings-shared md-select"></style>
     <settings-animated-pages id="pages" section="device">
       <neon-animatable id="main" route-path="default">
         <div id="pointersRow" class="settings-box first"
             on-tap="onPointersTap_" actionable>
           <div class="middle">
             [[getPointersTitle_(hasMouse_, hasTouchpad_)]]
           </div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="[[getPointersTitle_(hasMouse_,
+                                              hasTouchpad_)]]"></button>
         </div>
         <div id="keyboardRow" class="settings-box" on-tap="onKeyboardTap_"
             actionable>
           <div class="middle">$i18n{keyboardTitle}</div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{keyboardTitle}"></button>
         </div>
         <template is="dom-if" if="[[hasStylus_]]">
           <div id="stylusRow" class="settings-box" on-tap="onStylusTap_"
               actionable>
             <div class="middle">$i18n{stylusTitle}</div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{stylusTitle}"></button>
           </div>
         </template>
         <div id="displayRow" class="settings-box" on-tap="onDisplayTap_"
             actionable>
           <div class="middle">$i18n{displayTitle}</div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{displayTitle}"></button>
         </div>
         <div id="storageRow" class="settings-box" on-tap="onStorageTap_"
             actionable>
           <div class="middle">$i18n{storageTitle}</div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{storageTitle}"></button>
         </div>
         <template is="dom-if" if="[[enablePowerSettings_]]">
           <div id="powerRow" class="settings-box two-line">
             <div class="middle">
               <div>[[powerLabel_]]</div>
               <div class="secondary">[[batteryStatus_.statusText]]</div>
             </div>
             <div class="md-select-wrapper"
                 hidden$="[[!showPowerDropdown_]]">
               <select id="powerSource" class="md-select"
@@ skipping 51 matching lines @@
         <settings-subpage
             associated-control="[[$$('#storageRow')]]"
             page-title="$i18n{storageTitle}">
           <settings-storage></settings-storage>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="device_page.js"></script>
 </dom-module>