Add field-initializing constructors to generated mojo structs.

mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap

Index: mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap
diff --git a/mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap b/mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap
index a4c0f5ac4ac77391f438d772e660464d5c3712e1..50e8076a505893b53ed96aa3194c3865b55a8e5e 100644
--- a/mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap
+++ b/mojo/public/cpp/bindings/tests/test_native_types_chromium.typemap
@@ -3,8 +3,7 @@
 # found in the LICENSE file.
 
 mojom = "//mojo/public/interfaces/bindings/tests/test_native_types.mojom"
-public_headers =
-    [ "//mojo/public/cpp/bindings/tests/pickled_types_chromium.h" ]
+public_headers = [ "//mojo/public/cpp/bindings/tests/pickled_types_chromium.h" ]
 sources = [
   "//mojo/public/cpp/bindings/tests/pickled_types_chromium.cc",
 ]
@@ -14,5 +13,5 @@ deps = [
 
 type_mappings = [
   "mojo.test.PickledEnum=mojo::test::PickledEnumChromium",
-  "mojo.test.PickledStruct=mojo::test::PickledStructChromium"
+  "mojo.test.PickledStruct=mojo::test::PickledStructChromium[move_only]",
 ]