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..185ae8842f334e0537855125b228f284c948af24 100644
--- a/chromeos/login/auth/auth_status_consumer.h
+++ b/chromeos/login/auth/auth_status_consumer.h
@@ -95,10 +95,14 @@ 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; }

[jdufault, 2016/08/08 18:54:26]

set_used_pin(bool used_pin) { used_pin_ = used_pin; }

[sammiequon, 2016/08/09 00:31:25]

Done.

+  bool IsPinAttempt() const { return is_pin_attempt_; }

[jdufault, 2016/08/08 18:54:26]

bool used_pin() const { return used_pin_; }

[sammiequon, 2016/08/09 00:31:25]

Done.

+
  private:
   AuthFailure(FailureReason reason, GoogleServiceAuthError error)
       : reason_(reason), error_(error) {}
 
+  bool is_pin_attempt_ = false;

[jdufault, 2016/08/08 18:54:26]

Instead of plumbing through AuthStatusConsumer we can just move this variable to
ScreenLocker, similar to incorrect_password_count_.

[sammiequon, 2016/08/09 00:31:25]

Done.

   FailureReason reason_;
   GoogleServiceAuthError error_;
 };