Mojo C++ bindings: support enum validation.

mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl

 // Copyright 2013 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.
 
 {%- if variant -%}
 {%-   set variant_path = "%s-%s"|format(module.path, variant) -%}
 {%- else -%}
 {%-   set variant_path = module.path -%}
 {%- endif -%}
 
@@ skipping 33 matching lines @@
 {%- for namespace in namespaces_as_array %}
 namespace {{namespace}} {
 {%- endfor %}
 {%- if variant %}
 namespace {{variant}} {
 {%- endif %}
 
 {#--- Enums #}
 {% from "enum_macros.tmpl" import enum_decl -%}
 {% from "enum_macros.tmpl" import enum_stream_operator -%}
-{%  for enum in enums %}
+{% from "enum_macros.tmpl" import is_known_enum_value -%}
+{%- for enum in enums %}
   {{enum_decl(enum)}}
   {{enum_stream_operator(enum)}}
+  {{is_known_enum_value(enum)}}
 {%- endfor %}
 
 {#--- Constants #}
 {%- for constant in module.constants %}
 {#-   To be consistent with constants defined inside interfaces, only make
       integral types compile-time constants. #}
 {%-   if constant.kind|is_integral_kind %}
 const {{constant.kind|cpp_pod_type}} {{constant.name}} = {{constant|constant_value}};
 {%-   else %}
 extern const {{constant.kind|cpp_pod_type}} {{constant.name}};
@@ skipping 87 matching lines @@
 {%-   endfor %}
 {%- endif %}
 
 {#--- Union Serialization Helpers -#}
 {%  if unions %}
 {%    for union in unions %}
 {%      include "union_serialization_declaration.tmpl" %}
 {%-   endfor %}
 {%- endif %}
 
-{%  for struct in structs %}
-{%    for enum in struct.enums %}
+{%- for struct in structs %}
+{%-   for enum in struct.enums %}
 {{enum_stream_operator(enum)}}
+{{is_known_enum_value(enum)}}
 {%-   endfor %}
 {%- endfor %}
 
-{%  for interface in interfaces %}
-{%    for enum in interface.enums %}
+{%- for interface in interfaces %}
+{%-   for enum in interface.enums %}
 {{enum_stream_operator(enum)}}
+{{is_known_enum_value(enum)}}
 {%-   endfor %}
 {%- endfor %}
 
 {%- if variant %}
 }  // namespace {{variant}}
 {%- endif %}
 {%- for namespace in namespaces_as_array|reverse %}
 }  // namespace {{namespace}}
 {%- endfor %}
 
 #endif  // {{header_guard}}