[mojo] Support native types with mojom wire format

mojo/public/interfaces/bindings/tests/chromium_test.typemap

Index: mojo/public/interfaces/bindings/tests/chromium_test.typemap
diff --git a/mojo/public/interfaces/bindings/tests/chromium_test.typemap b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
index 102898295e369027d21c6daa926253d05b5d2a5f..95b08e6ad6fac357ac92f637e5955e4bf1abdd65 100644
--- a/mojo/public/interfaces/bindings/tests/chromium_test.typemap
+++ b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
@@ -9,6 +9,12 @@
       "headers": [
         "mojo/public/cpp/bindings/tests/pickled_struct_chromium.h"
       ]
+    },
+    "mojo.test.Rect": {
+      "typename": "mojo::test::RectChromium",
+      "headers": [
+        "mojo/public/cpp/bindings/tests/rect_chromium.h"
+      ]
     }
   }
 }