Make Smart Lock user pod icons work well with ChromeVox.

ui/login/account_picker/user_pod_row.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview User pod row implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 274 matching lines @@
      * @param {!string} id The id of the icon that should be shown. Should be
      *    one of the ids listed in {@code UserPodCustomIcon.ICONS}.
      */
     setIcon: function(id) {
       UserPodCustomIcon.ICONS.forEach(function(icon) {
         this.iconElement.classList.toggle(icon.class, id == icon.id);
       }, this);
     },
 
     /**
+     * Sets the ARIA label for the icon.
+     * @param {!string} ariaLabel
+     */
+    setAriaLabel: function(ariaLabel) {
+      this.iconElement.setAttribute('aria-label', ariaLabel);
+    },
+
+    /**
      * Shows the icon.
      */
     show: function() {
       this.resetHideTransitionState_();
       this.hidden = false;
     },
 
     /**
      * Hides the icon using a fade-out animation.
      */
@@ skipping 40 matching lines @@
       if (tooltip.text && tooltip.autoshow) {
         this.hideTooltip_(true);
         this.showTooltip_();
         this.tooltipAutoshown_ = true;
         // Reset the tooltip active flag, which gets set in |showTooltip_|.
         this.tooltipActive_ = false;
         return;
       }
 
       this.hideTooltip_(true);
-
-      if (this.tooltip_)
-        this.iconElement.setAttribute('aria-lablel', this.tooltip_);
     },
 
     /**
      * Sets up icon tabIndex attribute and handler for click and 'Enter' key
      * down events.
      * @param {?function()} callback If icon should be interactive, the
      *     function to get called on click and 'Enter' key down events. Should
      *     be null to make the icon  non interactive.
      */
     setInteractive: function(callback) {
@@ skipping 121 matching lines @@
      *     because autoshow flag was set.
      * @private
      */
     hideTooltip_: function(force) {
       this.tooltipActive_ = false;
       this.ensureTooltipTimeoutCleared_();
       if (!force && this.tooltipAutoshown_)
         return;
       $('bubble').hideForElement(this);
       this.tooltipAutoshown_ = false;
-      this.iconElement.removeAttribute('aria-label');
     },
 
     /**
      * Clears timaout for showing the tooltip if it's set.
      * @private
      */
     ensureTooltipTimeoutCleared_: function() {
       if (this.showTooltipTimeout_) {
         clearTimeout(this.showTooltipTimeout_);
         this.showTooltipTimeout_ = null;
@@ skipping 1729 matching lines @@
 
       this.shouldShowApps_ = shouldShowApps;
       this.rebuildPods();
     },
 
     /**
      * Shows a custom icon on a user pod besides the input field.
      * @param {string} username Username of pod to add button
      * @param {!{id: !string,
      *           hardlockOnClick: boolean,
+     *           ariaLabel: string | undefined,
      *           tooltip: ({text: string, autoshow: boolean} | undefined)}} icon
      *     The icon parameters.
      */
     showUserPodCustomIcon: function(username, icon) {
       var pod = this.getPodWithUsername_(username);
       if (pod == null) {
         console.error('Unable to show user pod button for ' + username +
                       ': user pod not found.');
         return;
       }
 
       if (!icon.id)
         return;
 
       pod.customIconElement.setIcon(icon.id);
 
       if (icon.hardlockOnClick) {
         pod.customIconElement.setInteractive(
             this.hardlockUserPod_.bind(this, username));
       } else {
         pod.customIconElement.setInteractive(null);
       }
 
+      var ariaLabel = icon.ariaLabel || (icon.tooltip && icon.tooltip.text);
+      if (ariaLabel)
+        pod.customIconElement.setAriaLabel(ariaLabel);
+      else
+        console.warn('No ARIA label for user pod custom icon.');
+
       pod.customIconElement.show();
 
       // This has to be called after |show| in case the tooltip should be shown
       // immediatelly.
       pod.customIconElement.setTooltip(
           icon.tooltip || {text: '', autoshow: false});
     },
 
     /**
      * Hard-locks user pod for the user. If user pod is hard-locked, it can be
@@ skipping 663 matching lines @@
        if (pod && pod.multiProfilesPolicyApplied) {
          pod.userTypeBubbleElement.classList.remove('bubble-shown');
        }
      }
   };
 
   return {
     PodRow: PodRow
   };
 });