[MD Settings] Add ARIA roles to profile image chooser for ChromeVox.

chrome/browser/resources/settings/people_page/change_picture.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/util.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../i18n_setup.html">
@@ skipping 81 matching lines @@
         display: block;
         margin: 0 auto 0 auto;
       }
     </style>
     <div id="container" class="settings-box" tabindex="0">
       <iron-a11y-keys keys="up down left right space enter"
           on-keys-pressed="onKeysPress_">
       </iron-a11y-keys>
       <div id="availableIcons" class="start">
         <iron-selector id="selector" on-iron-activate="onImageActivate_"
-            selected-item="{{selectedItem_}}">
-          <iron-icon id="cameraImage"
+            selected-item="{{selectedItem_}}" role="radiogroup">
+          <iron-icon id="cameraImage" role="radio"
               data-type$="[[selectionTypesEnum_.CAMERA]]"
               icon="settings:camera-alt" title="$i18n{takePhoto}"
               hidden="[[!cameraPresent_]]">
           </iron-icon>
-          <iron-icon data-type$="[[selectionTypesEnum_.FILE]]"
+          <iron-icon data-type$="[[selectionTypesEnum_.FILE]]" role="radio"
               icon="cr:folder" title="$i18n{chooseFile}">
           </iron-icon>
-          <img id="profileImage"
+          <img id="profileImage" role="radio"
               data-type$="[[selectionTypesEnum_.PROFILE]]"
               src="[[profileImageUrl_]]" title="$i18n{profilePhotoLoading}">
-          <img id="oldImage" data-type$="[[selectionTypesEnum_.OLD]]"
-              src="[[oldImageUrl_]]" hidden="[[!oldImageUrl_]]"
+          <img id="oldImage" data-type$="[[selectionTypesEnum_.OLD]]" 

[hcarmona, 2017/06/02 00:50:04]

nit: remove space at end of line

+              role="radio" src="[[oldImageUrl_]]" hidden="[[!oldImageUrl_]]"
               title="$i18n{oldPhoto}">
           <template is="dom-repeat" items="[[defaultImages_]]">
-            <img data-type$="[[selectionTypesEnum_.DEFAULT]]"
+            <img data-type$="[[selectionTypesEnum_.DEFAULT]]" role="radio" 
                 data-default-image-index$="[[index]]" src="[[item.url]]"
                 title="[[item.title]]">
           </template>
         </iron-selector>
         <template is="dom-if" if="[[isAuthorCreditShown_(selectedItem_)]]">
           <div id="authorCredit">
             $i18n{authorCredit}
             [[getAuthorName_(selectedItem_, defaultImages_)]]
             <a href="[[getAuthorWebsite_(selectedItem_, defaultImages_)]]"
                 target="_blank">
@@ skipping 14 matching lines @@
         </div>
         <settings-camera id="camera"
             camera-active="[[isCameraActive_(cameraPresent_, selectedItem_)]]"
             on-phototaken="onPhotoTaken_">
         </settings-camera>
       </div>
     </div>
   </template>
   <script src="change_picture.js"></script>
 </dom-module>