Limit Mojo messages recursion depth

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 "base/strings/stringprintf.h"
 #include "mojo/public/cpp/bindings/message.h"
 
 namespace mojo {
@@ skipping 37 matching lines @@
     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";
     case VALIDATION_ERROR_DESERIALIZATION_FAILED:
       return "VALIDATION_ERROR_DESERIALIZATION_FAILED";
+    case VALIDATION_ERROR_MAX_RECURSION_DEPTH:
+      return "VALIDATION_ERROR_MAX_RECURSION_DEPTH";
   }
 
   return "Unknown error";
 }
 
 void ReportValidationError(ValidationContext* context,
                            ValidationError error,
                            const char* description) {
   if (g_validation_error_observer) {
     g_validation_error_observer->set_last_error(error);
@@ skipping 59 matching lines @@
 }
 
 SerializationWarningObserverForTesting::
     ~SerializationWarningObserverForTesting() {
   DCHECK(g_serialization_warning_observer == this);
   g_serialization_warning_observer = nullptr;
 }
 
 }  // namespace internal
 }  // namespace mojo