Settings People Revamp: Change Picture: Add accessibility-key usage.

chrome/browser/resources/settings/people_page/change_picture.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/polymer/v1_0/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/image-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.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="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://md-settings/people_page/camera.html">
 <link rel="import" href="chrome://md-settings/people_page/change_picture_private_api.html">
 
 <dom-module id="settings-change-picture">
   <link rel="import" type="css"
       href="chrome://md-settings/settings_shared.css">
   <link rel="import" type="css" href="change_picture.css">
   <template>
     <div id="container" class="settings-box">
-      <div id="availableIcons" class="start">
+      <iron-a11y-keys keys="up down left right space enter"
+          on-keys-pressed="onKeysPress_">
+      </iron-a11y-keys>
+      <div id="availableIcons" class="start" tabindex="0">
         <iron-selector id="selector" on-iron-activate="onImageActivate_"
             selected-item="{{selectedItem_}}">
           <iron-icon id="cameraImage" data-type="camera" icon="image:camera-alt"
               i18n-values="alt:takePhoto" hidden="[[!cameraPresent_]]">
           </iron-icon>
           <iron-icon data-type="file" icon="folder"
               i18n-values="alt:chooseFile">
           </iron-icon>
           <img id="profileImage" data-type="profile"
               src="[[profileImageUrl_]]" i18n-values="alt:profilePhotoLoading">
@@ skipping 16 matching lines @@
         </template>
       </div>
       <div id="previewPane">
         <img i18n-values="alt:previewAltText" src="[[selectedItem_.src]]"
             hidden="[[isPreviewImageHidden_(selectedItem_)]]">
         <div id="discardControlBar" hidden="[[isDiscardHidden_(selectedItem_)]]">
           <paper-icon-button id="discardOldImage" tabindex="0" icon="delete"
               i18n-values="title:discardPhoto" on-tap="onTapDiscardOldImage_">
           </paper-icon-button>
         </div>
-        <settings-camera
+        <settings-camera id="camera"
             camera-active="[[isCameraActive_(cameraPresent_, selectedItem_)]]"
             on-phototaken="onPhotoTaken_">
       </div>
     </div>
   </template>
   <script src="change_picture.js"></script>
 </dom-module>