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

chrome/browser/signin/easy_unlock_metrics.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_EASY_UNLOCK_METRICS_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_METRICS_H_
 
 // Tracking login events for Easy unlock metrics.
 // This enum is used to define the buckets for an enumerated UMA histogram.
 // Hence,
@@ skipping 43 matching lines @@
   // Password is used because there is no screenlock state handler. Most likely
   // because EasyUnlock is disabled, e.g. Bluetooth adapter not ready.
   PASSWORD_ENTRY_NO_SCREENLOCK_STATE_HANDLER = 18,
   // Password is used because the phone is (a) locked, and (b) not right next to
   // the Chromebook.
   PASSWORD_ENTRY_PHONE_LOCKED_AND_TX_POWER_TOO_HIGH = 19,
 
   EASY_UNLOCK_AUTH_EVENT_COUNT  // Must be the last entry.
 };
 
+enum EasyUnlockTrialRunEvent {
+  // A trial run was initiated from the Easy Unlock setup app.
+  EASY_UNLOCK_TRIAL_RUN_EVENT_LAUNCHED = 0,
+  // The user clicked on the lock icon during the trial run.
+  EASY_UNLOCK_TRIAL_RUN_EVENT_CLICKED_LOCK_ICON = 1,
+  EASY_UNLOCK_TRIAL_RUN_EVENT_COUNT  // Must be the last entry.
+};
+
 void RecordEasyUnlockSigninEvent(EasyUnlockAuthEvent event);
 void RecordEasyUnlockScreenUnlockEvent(EasyUnlockAuthEvent event);
+void RecordEasyUnlockTrialRunEvent(EasyUnlockTrialRunEvent event);
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_METRICS_H_