Added PlatformHandle thunks.

mojo/public/platform/native/platform_handle_private.h

Index: mojo/public/platform/native/platform_handle_private.h
diff --git a/mojo/public/platform/native/platform_handle_private.h b/mojo/public/platform/native/platform_handle_private.h
new file mode 100644
index 0000000000000000000000000000000000000000..e81d572e80a09b0ac3fb7de65b85cb1db8215c7e
--- /dev/null
+++ b/mojo/public/platform/native/platform_handle_private.h
@@ -0,0 +1,35 @@
+// 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_PUBLIC_PLATFORM_NATIVE_PLATFORM_HANDLE_PRIVATE_H_
+#define MOJO_PUBLIC_PLATFORM_NATIVE_PLATFORM_HANDLE_PRIVATE_H_
+
+#include "mojo/public/c/system/types.h"
+
+typedef int MojoPlatformHandle;  // Unix file descriptor
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Wraps |platform_handle| in a MojoHandle so that it can transported. Returns
+// MOJO_RESULT_OK on success, all other results indicate failure. This takes
+// ownership of |platform_handle|, regardless of whether this succeeds.
+MojoResult MojoCreatePlatformHandleWrapper(MojoPlatformHandle platform_handle,
+                                           MojoHandle* wrapper);
+
+// Extracts |platform_handle| from |wrapper|. Returns MOJO_RESULT_OK on success,
+// all other results indicate failure. If this succeeds, it causes |wrapper| to
+// relinquish ownership of |platform_handle|, so MojoClose'ing |wrapper| will no
+// longer close the underlying |platform_handle|. Never the less, it is still
+// neccessary to MojoClose |wrapper|, but this will not affect the underlying
+// descriptor after this call.
+MojoResult MojoExtractPlatformHandle(MojoHandle wrapper,
+                                     MojoPlatformHandle* platform_handle);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_PLATFORM_HANDLE_PRIVATE_H_