Added uma for pin unlock set up.

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

Index: chrome/browser/resources/settings/people_page/setup_pin_dialog.js
diff --git a/chrome/browser/resources/settings/people_page/setup_pin_dialog.js b/chrome/browser/resources/settings/people_page/setup_pin_dialog.js
index f299a0eaea31aeff60d99f087c958cead71f0664..3c62f90452e8e873bc46f60c268d654b85633c61 100644
--- a/chrome/browser/resources/settings/people_page/setup_pin_dialog.js
+++ b/chrome/browser/resources/settings/people_page/setup_pin_dialog.js
@@ -204,6 +204,7 @@ Polymer({
         this.isConfirmStep_ = true;
         this.onPinChange_();
         this.$.pinKeyboard.focus();
+        recordLockScreenProgress(LockScreenProgress.ENTER_PIN);
       }
     } else {
       // onPinSubmit_ gets called if the user hits enter on the PIN keyboard.
@@ -226,6 +227,7 @@ Polymer({
         [chrome.quickUnlockPrivate.QuickUnlockMode.PIN],
         [this.pinKeyboardValue_],
         onSetModesCompleted.bind(this));
+      recordLockScreenProgress(LockScreenProgress.CONFIRM_PIN);
     }
   },