MD Settings: add an aria-label to control indicators (often policy)

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.html

 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <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/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="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../icons.html">
 <link rel="import" href="../prefs/prefs.html">
 <link rel="import" href="../settings_page/settings_animated_pages.html">
@@ skipping 10 matching lines @@
         <div id="bluetoothDevices"
             class="settings-box two-line" actionable on-tap="onTap_">
           <iron-icon icon="[[getIcon_(bluetoothEnabled_)]]"></iron-icon>
           <div class="middle">
             $i18n{bluetoothPageTitle}
             <div class="secondary" id="bluetoothSecondary">
               [[getOnOffString_(bluetoothEnabled_,
               '$i18nPolymer{deviceOn}', '$i18nPolymer{deviceOff}')]]
             </div>
           </div>
-          <cr-policy-pref-indicator
+          <cr-policy-pref-indicator icon-aria-label="$i18n{bluetoothPageTitle}"
               pref="[[prefs.cros.device.allow_bluetooth]]"
             hidden="[[prefs.cros.device.allow_bluetooth.value]]">
           </cr-policy-pref-indicator>
           <button class="subpage-arrow" is="paper-icon-button-light"
               on-tap="onSubpageArrowTap_" aria-label="$i18n{bluetoothPageTitle}"
               aria-describedby="bluetoothSecondary">
           </button>
           <div class="secondary-action">
             <paper-toggle-button id="enableBluetooth"
                 checked="{{bluetoothEnabled_}}"
@@ skipping 13 matching lines @@
               bluetooth="[[bluetooth]]"
               bluetooth-private="[[bluetoothPrivate]]">
           </settings-bluetooth-subpage>
         </settings-subpage>
       </template>
 
     </settings-animated-pages>
   </template>
   <script src="bluetooth_page.js"></script>
 </dom-module>