JavaScript bindings for Mojo message validation

mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl

Index: mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl b/mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl
index ae1ccb079afc63819a9862ec795f04743362f059..e4fcc84b15dda9bbc4def344eb0440d6e4a6bbeb 100644
--- a/mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl
@@ -21,6 +21,42 @@
 {%- endfor %}
   };
 
+{#--- Validation #}
+
+  {{struct.name}}.validate = function(messageValidator, offset) {
+    var err;
+
+    err = messageValidator.validateStructHeader(offset, {{struct.name}}.encodedSize, {{struct.packed.packed_fields|length}});
+    if (err !== validator.validationError.NONE)
+        return err;
+{%-  for packed_field in struct.packed.packed_fields %}
+{%-   set fieldName = packed_field.field.name %}
+{%-   if packed_field.field|is_string_pointer_field %}
+    // validate {{struct.name}}.{{fieldName}}
+    err = messageValidator.validateStringPointer({{packed_field|field_offset}})
+    if (err !== validator.validationError.NONE)
+        return err;
+{%-  elif packed_field.field|is_array_pointer_field %}
+    // validate {{struct.name}}.{{fieldName}}
+    err = messageValidator.validateArrayPointer({{packed_field|validate_array_params}});
+    if (err !== validator.validationError.NONE)
+        return err;
+{%-   elif packed_field.field|is_struct_pointer_field %}
+    // validate {{struct.name}}.{{fieldName}}
+    err = messageValidator.validateStructPointer({{packed_field|validate_struct_params}});
+    if (err !== validator.validationError.NONE)
+        return err;
+{%-   elif packed_field.field|is_handle_field %}
+    // validate {{struct.name}}.{{fieldName}}
+    err = messageValidator.validateHandle({{packed_field|field_offset}})
+    if (err !== validator.validationError.NONE)
+        return err;
+{%-   endif %}
+{%- endfor %}
+
+    return validator.validationError.NONE;
+  };
+
 {#--- Encoding and decoding #}
 
   {{struct.name}}.encodedSize = codec.kStructHeaderSize + {{struct.packed|payload_size}};