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

chrome/browser/signin/easy_unlock_metrics.cc

Index: chrome/browser/signin/easy_unlock_metrics.cc
diff --git a/chrome/browser/signin/easy_unlock_metrics.cc b/chrome/browser/signin/easy_unlock_metrics.cc
index 892d752857121789d2f76af5ab1f13be8c0592e5..ba46c7f6479ade8cbd853d36add7859e7c02036e 100644
--- a/chrome/browser/signin/easy_unlock_metrics.cc
+++ b/chrome/browser/signin/easy_unlock_metrics.cc
@@ -18,3 +18,10 @@ void RecordEasyUnlockScreenUnlockEvent(EasyUnlockAuthEvent event) {
   UMA_HISTOGRAM_ENUMERATION("EasyUnlock.AuthEvent.Unlock", event,
                             EASY_UNLOCK_AUTH_EVENT_COUNT);
 }
+
+void RecordEasyUnlockTrialRunEvent(EasyUnlockTrialRunEvent event) {
+  DCHECK_LT(event, EASY_UNLOCK_TRIAL_RUN_EVENT_COUNT);
+  UMA_HISTOGRAM_ENUMERATION("EasyUnlock.TrialRun.Events",
+                            event,
+                            EASY_UNLOCK_TRIAL_RUN_EVENT_COUNT);
+}