UMA for pin unlock success/failure.

chromeos/login/auth/auth_status_consumer.h

Index: chromeos/login/auth/auth_status_consumer.h
diff --git a/chromeos/login/auth/auth_status_consumer.h b/chromeos/login/auth/auth_status_consumer.h
index ad202a5c8a4bba857b7dc1cc2f72699c0e99ef90..40e351ee6722379fec51c9b6554082adbe2ae91d 100644
--- a/chromeos/login/auth/auth_status_consumer.h
+++ b/chromeos/login/auth/auth_status_consumer.h
@@ -40,7 +40,9 @@ class CHROMEOS_EXPORT AuthFailure {
   };
 
   explicit AuthFailure(FailureReason reason)
-      : reason_(reason), error_(GoogleServiceAuthError::NONE) {
+      : is_pin_attempt_(false),

[jdufault, 2016/08/04 19:42:04]

Initialize in declaration (line 107) instead of in the ctor for constant values.

[sammiequon, 2016/08/05 01:46:00]

Done.

+        reason_(reason),
+        error_(GoogleServiceAuthError::NONE) {
     DCHECK(reason != NETWORK_AUTH_FAILED);
   }
 
@@ -95,10 +97,14 @@ class CHROMEOS_EXPORT AuthFailure {
   const GoogleServiceAuthError& error() const { return error_; }
   const FailureReason& reason() const { return reason_; }
 
+  void SetIsPinAttempt(bool tried_pin) { is_pin_attempt_ = tried_pin; }
+  bool IsPinAttempt() const { return is_pin_attempt_; }
+
  private:
   AuthFailure(FailureReason reason, GoogleServiceAuthError error)
-      : reason_(reason), error_(error) {}
+      : is_pin_attempt_(false), reason_(reason), error_(error) {}
 
+  bool is_pin_attempt_;
   FailureReason reason_;
   GoogleServiceAuthError error_;
 };