Mojo cpp bindings: add support for validating incoming messages.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
index 6a0f6cfcd42f1b57ccf0824224731608f78f2d10..1a699da09b8675b6fc226ec4f25a0da92b3606bf 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl
@@ -12,6 +12,7 @@
 #include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/bindings/interface_impl.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
+#include "mojo/public/cpp/bindings/lib/message_validator.h"
 #include "mojo/public/cpp/bindings/no_interface.h"
 #include "{{module.path}}-internal.h"
 {%- for import in imports %}
@@ -53,6 +54,16 @@ typedef mojo::InterfacePtr<{{interface.name}}> {{interface.name}}Ptr;
 {%    include "interface_stub_declaration.tmpl" %}
 {%- endfor %}
 
+{#--- Interface Request Validators -#}
+{%  for interface in interfaces %}
+{%    include "interface_request_validator_declaration.tmpl" %}
+{%- endfor %}
+
+{#--- Interface Response Validators -#}
+{%  for interface in interfaces if interface|has_callbacks %}
+{%    include "interface_response_validator_declaration.tmpl" %}
+{%- endfor %}
+
 {%- for namespace in namespaces_as_array|reverse %}
 }  // namespace {{namespace}}
 {%- endfor %}