Mojo C++ bindings: support enum validation.

mojo/public/cpp/bindings/lib/validation_errors.cc

 // 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.
 
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 namespace internal {
@@ skipping 32 matching lines @@
     case VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAGS:
       return "VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAGS";
     case VALIDATION_ERROR_MESSAGE_HEADER_MISSING_REQUEST_ID:
       return "VALIDATION_ERROR_MESSAGE_HEADER_MISSING_REQUEST_ID";
     case VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD:
       return "VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD";
     case VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP:
       return "VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP";
     case VALIDATION_ERROR_UNKNOWN_UNION_TAG:
       return "VALIDATION_ERROR_UNKNOWN_UNION_TAG";
+    case VALIDATION_ERROR_UNKNOWN_ENUM_VALUE:
+      return "VALIDATION_ERROR_UNKNOWN_ENUM_VALUE";
   }
 
   return "Unknown error";
 }
 
 void ReportValidationError(ValidationError error, const char* description) {
   if (g_validation_error_observer) {
     g_validation_error_observer->set_last_error(error);
   } else if (description) {
     MOJO_LOG(ERROR) << "Invalid message: " << ValidationErrorToString(error)
@@ skipping 31 matching lines @@
 }
 
 SerializationWarningObserverForTesting::
     ~SerializationWarningObserverForTesting() {
   MOJO_DCHECK(g_serialization_warning_observer == this);
   g_serialization_warning_observer = nullptr;
 }
 
 }  // namespace internal
 }  // namespace mojo