Added uma for pin unlock set up.

chrome/browser/resources/settings/people_page/setup_pin_dialog.js

 // Copyright 2016 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
  * 'settings-setup-pin-dialog' is the settings page for choosing a PIN.
  *
  * Example:
  *
@@ skipping 43 matching lines @@
      */
     problemClass_: String,
 
     /**
      * Should the step-specific submit button be displayed?
      * @private
      */
     enableSubmit_: Boolean,
 
     /**
+     * writeUma_ is a function that handles writing uma stats. It may be
+     * overridden for tests.
+     *
+     * @type {Function}
+     * @private
+     */
+    writeUma_: {
+      type: Object,
+      value: function() { return settings.recordLockScreenProgress; }
+    },
+
+    /**
      * The current step/subpage we are on.
      * @private
      */
     isConfirmStep_: {
       type: Boolean,
       value: false
     },
   },
 
   /** @override */
@@ skipping 129 matching lines @@
 
   /** @private */
   onPinSubmit_: function() {
     if (!this.isConfirmStep_) {
       if (this.isPinLongEnough_(this.pinKeyboardValue_)) {
         this.initialPin_ = this.pinKeyboardValue_;
         this.pinKeyboardValue_ = '';
         this.isConfirmStep_ = true;
         this.onPinChange_();
         this.$.pinKeyboard.focus();
+        this.writeUma_(LockScreenProgress.ENTER_PIN);
       }
     } else {
       // onPinSubmit_ gets called if the user hits enter on the PIN keyboard.
       // The PIN is not guaranteed to be valid in that case.
       if (!this.isPinConfirmed_()) {
         this.showProblem_('configurePinMismatched', 'error');
         return;
       }
 
       function onSetModesCompleted(didSet) {
         if (!didSet) {
           console.error('Failed to update pin');
           return;
         }
 
         this.resetState_();
         this.fire('done');
       }
 
       this.setModes.call(
         null,
         [chrome.quickUnlockPrivate.QuickUnlockMode.PIN],
         [this.pinKeyboardValue_],
         onSetModesCompleted.bind(this));
+      this.writeUma_(LockScreenProgress.CONFIRM_PIN);
     }
   },
 
   /**
    * @private
    * @param {string} problemMessage
    * @return {boolean}
    */
   hasProblem_: function(problemMessage) {
     return !!problemMessage;
@@ skipping 13 matching lines @@
    * @private
    * @param {boolean} isConfirmStep
    * @return {string}
    */
   getContinueMessage_: function(isConfirmStep) {
     return this.i18n(isConfirmStep ? 'confirm' : 'configurePinContinueButton');
   },
 });
 
 })();