Add mojo structs for ScopedFD and ScopedHandle.

mojo/common/test_invalid_typemapped_type.mojom

Index: mojo/common/test_invalid_typemapped_type.mojom
diff --git a/mojo/common/test_invalid_typemapped_type.mojom b/mojo/common/test_invalid_typemapped_type.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..7f15621a6bbd473fe5b4a690afd82894b74907e4
--- /dev/null
+++ b/mojo/common/test_invalid_typemapped_type.mojom
@@ -0,0 +1,16 @@
+// 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.common.test.mojom;
+
+struct InvalidTypemappedType {};
+
+interface TestInvalidTypemappedType {
+  [Sync]
+  BounceNullableInvalidTypemappedType(InvalidTypemappedType? in)
+      => (InvalidTypemappedType? out);
+  [Sync]
+  BounceInvalidTypemappedType(InvalidTypemappedType in)
+      => (InvalidTypemappedType out);
+};