Mojo: Align string sizes when serializing a native type.

mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h

Index: mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h
diff --git a/mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h b/mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h
index 94330525483ccbfaf12d171434c5a70c8bfbe450..e945abcaca25f6b65db46dd190409e66a827b819 100644
--- a/mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h
+++ b/mojo/public/cpp/bindings/tests/struct_with_traits_impl_traits.h
@@ -38,6 +38,10 @@ struct StructTraits<test::StructWithTraits, test::StructWithTraitsImpl> {
   static base::StringPiece f_string(const test::StructWithTraitsImpl& value) {
     return value.get_string();
   }
+
+  static base::StringPiece f_string2(const test::StructWithTraitsImpl& value) {
+    return value.get_string();
+  }
 };
 
 }  // namespace mojo