Stub in more IPC attachment brokering functionality.

ipc/ipc_handle_win.cc

Index: ipc/ipc_handle_win.cc
diff --git a/ipc/ipc_handle_win.cc b/ipc/ipc_handle_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c7317315b974b9e2cb1bfe1cfcecba523dc35f03
--- /dev/null
+++ b/ipc/ipc_handle_win.cc
@@ -0,0 +1,15 @@
+// Copyright 2015 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 "ipc/ipc_handle_win.h"
+
+namespace IPC {
+
+HandleForTransit CreateHandleForTransit(HANDLE handle) {
+  HandleForTransit hft;
+  hft.handle = handle;
+  return hft;
+}
+
+}  // namespace IPC