Stub in more IPC attachment brokering functionality.

ipc/ipc_handle_win.h

Index: ipc/ipc_handle_win.h
diff --git a/ipc/ipc_handle_win.h b/ipc/ipc_handle_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..47779bdefcdc53b462ea956e3c305651ef62d717
--- /dev/null
+++ b/ipc/ipc_handle_win.h
@@ -0,0 +1,22 @@
+// 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.
+
+#ifndef IPC_HANDLE_WIN_H_
+#define IPC_HANDLE_WIN_H_
+
+#include <windows.h>
+
+namespace IPC {
+
+// This class is a wrapper around HANDLE. It can be passed between Chrome
+// processes via Chrome IPC.
+struct HandleForTransit {
+  HANDLE handle;
+};
+
+HandleForTransit CreateHandleForTransit(HANDLE handle);
+
+}  // namespace IPC
+
+#endif  // IPC_HANDLE_WIN_H_