Added PlatformHandle thunks.

shell/platform_handle_impl.cc

+// 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.
+
+// This file contains implementations for the platform handle thunks
+// (see //mojo/public/platform/native/platform_handle_private.h)
+
+#include "base/logging.h"
+#include "mojo/edk/embedder/embedder.h"
+#include "mojo/public/platform/native/platform_handle_private.h"
+
+using mojo::platform::PlatformHandle;
+using mojo::platform::ScopedPlatformHandle;
+
+MojoResult MojoCreatePlatformHandleWrapper(MojoPlatformHandle platform_handle,
+                                           MojoHandle* wrapper) {
+  PlatformHandle platform_handle_wrapper(platform_handle);
+  ScopedPlatformHandle scoped_platform_handle(platform_handle_wrapper);
+  return mojo::embedder::CreatePlatformHandleWrapper(
+      scoped_platform_handle.Pass(), wrapper);
+}
+
+MojoResult MojoExtractPlatformHandle(MojoHandle wrapper,
+                                     MojoPlatformHandle* platform_handle) {
+  ScopedPlatformHandle scoped_platform_handle;
+  MojoResult result = mojo::embedder::PassWrappedPlatformHandle(
+      wrapper, &scoped_platform_handle);
+  if (result != MOJO_RESULT_OK)
+    return result;
+
+  DCHECK(scoped_platform_handle.is_valid());
+  *platform_handle = scoped_platform_handle.release().fd;
+  return MOJO_RESULT_OK;
+}