Mojo typemap config: support "copyable_pass_by_value" attribute.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module mojo.test;
 
 // TODO(yzshen): Rename *WithTraits* types to something more readable.
 
 struct NestedStructWithTraits {
   int32 value;
@@ skipping 15 matching lines @@
   NestedStructWithTraits f_struct;
   array<NestedStructWithTraits> f_struct_array;
   map<string, NestedStructWithTraits> f_struct_map;
 };
 
 // Test that this container can be cloned.
 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 {
   int32 f_int32;
 };
 
 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);
 
   EchoStructWithTraitsForUniquePtrTest(StructWithTraitsForUniquePtrTest e) => (
       StructWithTraitsForUniquePtrTest passed);
 };