Adds thunks for getting platform handles

mojo/platform_handle/platform_handle_functions.h

Index: mojo/platform_handle/platform_handle_functions.h
diff --git a/mojo/platform_handle/platform_handle_functions.h b/mojo/platform_handle/platform_handle_functions.h
new file mode 100644
index 0000000000000000000000000000000000000000..424659d6f436b08b1ddc835fb679bbe4559833b4
--- /dev/null
+++ b/mojo/platform_handle/platform_handle_functions.h
@@ -0,0 +1,27 @@
+// 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_FUNCTIONS_H_
+#define MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_FUNCTIONS_H_
+
+#include "mojo/platform_handle/platform_handle.h"
+#include "mojo/platform_handle/platform_handle_exports.h"
+#include "third_party/mojo/src/mojo/public/c/system/types.h"
+
+extern "C" {
+
+// Wraps |platform_handle| in a MojoHandle so that it can trasported, returns

[viettrungluu, 2015/05/01 17:05:51]

trasported -> transported

[sky, 2015/05/01 17:18:45]

Done.

+// true on success. This takes ownership of |platform_handle|, regardless of
+// whether this succeeds.
+PLATFORM_HANDLE_EXPORT bool MojoCreatePlatformHandleWrapper(

[viettrungluu, 2015/05/01 17:05:51]

Note that this is dubious as a C API, since C90 doesn't have bool. (And for C99,
it's a complicated story, involving <stdbool.h> and _Bool, at which point one
might worry about compatibility with C++'s bool.

If you want to be consistent with other Mojo system primitives, you'd return a
MojoResult.

[sky, 2015/05/01 17:18:45]

Done.

+    MojoPlatformHandle platform_handle,
+    MojoHandle* wrapper);
+
+PLATFORM_HANDLE_EXPORT bool MojoExtractPlatformHandle(
+    MojoHandle wrapper,
+    MojoPlatformHandle* platform_handle);
+
+}  // extern "C"
+
+#endif  // MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_FUNCTIONS_H_