Mojo typemap config: support "copyable_pass_by_value" attribute.

mojo/public/interfaces/bindings/tests/struct_with_traits.mojom

Index: mojo/public/interfaces/bindings/tests/struct_with_traits.mojom
diff --git a/mojo/public/interfaces/bindings/tests/struct_with_traits.mojom b/mojo/public/interfaces/bindings/tests/struct_with_traits.mojom
index b1b7437e89c52767fb1884c7026a2a5f3483fe2e..d395a73b015445df8ba17ecd19a66a476d2ffb2b 100644
--- a/mojo/public/interfaces/bindings/tests/struct_with_traits.mojom
+++ b/mojo/public/interfaces/bindings/tests/struct_with_traits.mojom
@@ -33,14 +33,20 @@ struct StructWithTraitsContainer {
   StructWithTraits f_struct;
 };
 
-struct PassByValueStructWithTraits {
+// Maps to a pass-by-value trivial struct.
+struct TrivialStructWithTraits {
+  int32 value;
+};
+
+// Maps to a move-only struct.
+struct MoveOnlyStructWithTraits {
   handle f_handle;
 };
 
-// The custom type for PassByValueStructWithTraits is not clonable. Test that
+// The custom type for MoveOnlyStructWithTraits is not clonable. Test that
 // this container can compile as long as Clone() is not used.
-struct PassByValueStructWithTraitsContainer {
-  PassByValueStructWithTraits f_struct;
+struct MoveOnlyStructWithTraitsContainer {
+  MoveOnlyStructWithTraits f_struct;
 };
 
 struct StructWithTraitsForUniquePtrTest {
@@ -50,8 +56,11 @@ struct StructWithTraitsForUniquePtrTest {
 interface TraitsTestService {
   EchoStructWithTraits(StructWithTraits s) => (StructWithTraits passed);
 
-  EchoPassByValueStructWithTraits(PassByValueStructWithTraits s) =>
-      (PassByValueStructWithTraits passed);
+  EchoTrivialStructWithTraits(TrivialStructWithTraits s) =>
+      (TrivialStructWithTraits passed);
+
+  EchoMoveOnlyStructWithTraits(MoveOnlyStructWithTraits s) =>
+      (MoveOnlyStructWithTraits passed);
 
   EchoEnumWithTraits(EnumWithTraits e) => (EnumWithTraits passed);