Adds thunks for getting platform handles

mojo/platform_handle/platform_handle.h

Index: mojo/platform_handle/platform_handle.h
diff --git a/mojo/platform_handle/platform_handle.h b/mojo/platform_handle/platform_handle.h
new file mode 100644
index 0000000000000000000000000000000000000000..5facce3815339c48c8c1fa1b4eed3736a68cfd06
--- /dev/null
+++ b/mojo/platform_handle/platform_handle.h
@@ -0,0 +1,20 @@
+// 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 MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_H_
+#define MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#if defined(OS_WIN)
+using MojoPlatformHandle = HANDLE;
+#elif defined(OS_POSIX)
+using MojoPlatformHandle = int;
+#endif
+
+#endif  // MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_FUNCTIONS_H_