Add mojo structs for ScopedFD and ScopedHandle.

mojo/common/common_custom_types_struct_traits_win.h

Index: mojo/common/common_custom_types_struct_traits_win.h
diff --git a/mojo/common/common_custom_types_struct_traits_win.h b/mojo/common/common_custom_types_struct_traits_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..317bfda1cf36af13079ce1c0286f797a9fe170dd
--- /dev/null
+++ b/mojo/common/common_custom_types_struct_traits_win.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_WIN_H_
+#define MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_WIN_H_
+
+#include "base/win/scoped_handle.h"
+#include "mojo/common/mojo_common_export.h"
+#include "mojo/common/platform_handle.mojom-shared.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<common::mojom::WindowsHandleDataView,
+                    base::win::ScopedHandle> {
+  static bool IsNull(const base::win::ScopedHandle& handle) {
+    return !handle.IsValid();
+  }
+
+  static void SetToNull(base::win::ScopedHandle* handle) {
+    *handle = base::win::ScopedHandle();
+  }
+
+  static mojo::ScopedHandle wrapped_handle(base::win::ScopedHandle& handle);
+  static bool Read(common::mojom::WindowsHandleDataView data,
+                   base::win::ScopedHandle* handle);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_WIN_H_