Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/tools/bindings/generators/cpp_templates/enum_macros.tmpl

 {#---
   Macro for enum definition, and the declaration of associated functions.
 ---#}
 {%- macro enum_decl(enum) %}
 enum class {{enum.name}} : int32_t {
 {%- for field in enum.fields %}
 {%-    if field.value %}
   {{field.name}} = {{field.value|expression_to_text}},
 {%-    else %}
   {{field.name}},
@@ skipping 12 matching lines @@
     switch (value) {
 {%-   for enum_field in enum.fields|groupby('numeric_value') %}
       case {{enum_field[0]}}:
 {%-   endfor %}
         return true;
     }
 {%- endif %}
     return false;
   }
 
-  static bool Validate(int32_t value) {
+  static bool Validate(int32_t value,
+                       mojo::internal::ValidationContext* validation_context) {
     if (kIsExtensible || IsKnownValue(value))
       return true;
 
-    ReportValidationError(mojo::internal::VALIDATION_ERROR_UNKNOWN_ENUM_VALUE);
+    ReportValidationError(validation_context,
+                          mojo::internal::VALIDATION_ERROR_UNKNOWN_ENUM_VALUE);
     return false;
   }
 };
 {%- endmacro %}
 
 {#--- macros for enum-associated functions. Namely:
   * operator<<(): outputs the given enum value.
   * IsKnownEnumValue(): returns true if the given enum value exists in this
         generated version of enum.
 ---#}
@@ skipping 18 matching lines @@
   }
 }
 {%- endmacro %}
 
 {%- macro is_known_enum_value(enum) %}
 inline bool IsKnownEnumValue({{enum|get_name_for_kind}} value) {
   return {{enum|get_qualified_name_for_kind(internal=True)}}::IsKnownValue(
       static_cast<int32_t>(value));
 }
 {%- endmacro %}