Add mojo structs for ScopedFD and ScopedHandle.

mojo/common/common_custom_types_struct_traits_win.cc

Index: mojo/common/common_custom_types_struct_traits_win.cc
diff --git a/mojo/common/common_custom_types_struct_traits_win.cc b/mojo/common/common_custom_types_struct_traits_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3e6808f9574f1bea8a0072e8920fc4119725ddf4
--- /dev/null
+++ b/mojo/common/common_custom_types_struct_traits_win.cc
@@ -0,0 +1,31 @@
+// 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.
+
+#include "mojo/common/common_custom_types_struct_traits_win.h"
+
+#include "mojo/public/cpp/system/platform_handle.h"
+
+namespace mojo {
+
+mojo::ScopedHandle StructTraits<
+    common::mojom::WindowsHandleDataView,
+    base::win::ScopedHandle>::wrapped_handle(base::win::ScopedHandle& handle) {
+  DCHECK(handle.IsValid());
+  return mojo::WrapPlatformFile(handle.Take());
+}
+
+bool StructTraits<
+    common::mojom::WindowsHandleDataView,
+    base::win::ScopedHandle>::Read(common::mojom::WindowsHandleDataView data,
+                                   base::win::ScopedHandle* handle) {
+  base::PlatformFile platform_handle = base::kInvalidPlatformFile;
+  if (mojo::UnwrapPlatformFile(data.TakeWrappedHandle(), &platform_handle) !=
+      MOJO_RESULT_OK) {
+    return false;
+  }
+  *handle = base::win::ScopedHandle(platform_handle);
+  return true;
+}
+
+}  // namespace mojo