| Index: mojo/public/cpp/bindings/lib/validation_errors.h | 
| diff --git a/mojo/public/cpp/bindings/lib/validation_errors.h b/mojo/public/cpp/bindings/lib/validation_errors.h | 
| index 80a66fb40140fbc3525525f3a5f1add54172ce4d..fab16c1755db4ccbdf252af9c1219a9c1160583e 100644 | 
| --- a/mojo/public/cpp/bindings/lib/validation_errors.h | 
| +++ b/mojo/public/cpp/bindings/lib/validation_errors.h | 
| @@ -59,7 +59,9 @@ enum ValidationError { | 
| // lengths. | 
| VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP, | 
| // Attempted to deserialize a tagged union with an unknown tag. | 
| -  VALIDATION_ERROR_UNKNOWN_UNION_TAG | 
| +  VALIDATION_ERROR_UNKNOWN_UNION_TAG, | 
| +  // A value of a non-extensible enum type is unknown. | 
| +  VALIDATION_ERROR_UNKNOWN_ENUM_VALUE | 
| }; | 
|  | 
| const char* ValidationErrorToString(ValidationError error); | 
|  |