Mojo: (Theoretically) implement the read side of platform handle passing.

mojo/embedder/platform_handle_vector.cc

+// Copyright 2014 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.
+
+#include "mojo/embedder/platform_handle_vector.h"
+
+namespace mojo {
+namespace embedder {
+
+void CloseAllHandlesAndClear(PlatformHandleVector* platform_handles) {
+  for (PlatformHandleVector::iterator it = platform_handles->begin();
+       it != platform_handles->end();
+       ++it)
+    it->CloseIfNecessary();
+  platform_handles->clear();
+}
+
+}  // namespace embedder
+}  // namespace mojo