[Smart Lock] Measure clicks on the lock icon during Easy Unlock's trial run.

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 2409 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,
+     *           isTrialRun: 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 && !icon.tooltip)
         return;
 
       if (icon.id)
         pod.customIconElement.setIcon(icon.id);
 
-      if (icon.hardlockOnClick) {
+      if (icon.isTrialRun) {
+        pod.customIconElement.setInteractive(
+            this.onDidClickLockIconDuringTrialRun_.bind(this, username));
+      } else 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
@@ skipping 12 matching lines @@
      * only unlocked using password, and the authentication type cannot be
      * changed.
      * @param {!string} username The user's username.
      * @private
      */
     hardlockUserPod_: function(username) {
       chrome.send('hardlockPod', [username]);
     },
 
     /**
+     * Records a metric indicating that the user clicked on the lock icon during
+     * the trial run for Easy Unlock.
+     * @param {!string} username The user's username.
+     * @private
+     */
+    onDidClickLockIconDuringTrialRun_: function(username) {
+      chrome.send('recordClickOnLockIcon', [username]);
+    },
+
+    /**
      * Hides the custom icon in the user pod added by showUserPodCustomIcon().
      * @param {string} username Username of pod to remove button
      */
     hideUserPodCustomIcon: function(username) {
       var pod = this.getPodWithUsername_(username);
       if (pod == null) {
         console.error('Unable to hide user pod button for ' + username +
                       ': user pod not found.');
         return;
       }
@@ skipping 640 matching lines @@
        if (pod && pod.multiProfilesPolicyApplied) {
          pod.userTypeBubbleElement.classList.remove('bubble-shown');
        }
      }
   };
 
   return {
     PodRow: PodRow
   };
 });