[mojo] Add Mojo bindings support for IPC::ParamTraits

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

Index: mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
index f28948aab179fafae4b28a5638cafca67b68d79b..8f71c6566bccb10a992c8648fcefc1604a832395 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl
@@ -16,6 +16,11 @@
 {%-   for pf in struct.packed.packed_fields_in_ordinal_order if pf.field.kind|is_object_kind %}
 {%-     if pf.field.kind|is_union_kind %}
   size += GetSerializedSize_({{input_field_pattern|format(pf.field.name)}}, true);
+{%-     elif pf.field.kind|is_native_kind %}
+  // TODO(rockot): Support sizing of native kinds. This requires adding support
+  // to IPC::ParamTraits. It's not checked and is only used for preallocating
+  // space, so for now we just short the size result and let the buffer grow
+  // a little dynamically when needed.
 {%-     else %}
   size += GetSerializedSize_({{input_field_pattern|format(pf.field.name)}});
 {%-     endif %}
@@ -57,6 +62,9 @@
 {%-     elif kind|is_union_kind %}
   internal::{{kind.name}}_Data* {{name}}_ptr = &{{output}}->{{name}};
   SerializeUnion_(std::move({{input_field}}), {{buffer}}, &{{name}}_ptr, true);
+{%-     elif kind|is_native_kind %}
+  mojo::internal::SerializeNative_(
+      {{input_field}}, {{buffer}}, &{{output}}->{{name}}.ptr);
 {%-     else %}
   Serialize_(std::move({{input_field}}), {{buffer}}, &{{output}}->{{name}}.ptr);
 {%-     endif %}
@@ -133,9 +141,16 @@
 {%-     endif %}
 {%-     if kind|is_object_kind %}
 {%-       if kind|is_union_kind %}
-    Deserialize_(&{{input}}->{{name}}, &{{output_field}}, {{context}});
+    if (!Deserialize_(&{{input}}->{{name}}, &{{output_field}}, {{context}}))
+      return false;
+{%-       elif kind|is_native_kind %}
+    if (!DeserializeNative_(
+            {{input}}->{{name}}.ptr, &{{output_field}}, {{context}})) {
+      return false;
+    }
 {%-       else %}
-    Deserialize_({{input}}->{{name}}.ptr, &{{output_field}}, {{context}});
+    if (!Deserialize_({{input}}->{{name}}.ptr, &{{output_field}}, {{context}}))
+      return false;
 {%-       endif %}
 {%-     elif kind|is_interface_kind %}
     mojo::internal::InterfaceDataToPointer(&{{input}}->{{name}}, &{{output_field}});