Ensure X509Certificate::OSCertHandles are safe to be used on both UI and IO threads on Win

net/base/x509_util_mac.cc

Index: net/base/x509_util_mac.cc
diff --git a/net/base/x509_util_mac.cc b/net/base/x509_util_mac.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c381e0869c53fca86afff4ce99fb5c828480e0ee
--- /dev/null
+++ b/net/base/x509_util_mac.cc
@@ -0,0 +1,31 @@
+// Copyright (c) 2011 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 "net/base/x509_util_mac.h"
+
+#include "net/base/x509_certificate.h"
+
+namespace net {
+
+namespace x509_util {
+
+CFArrayRef CreateOSCertChainForCert(const X509Certificate* cert) {
+  CFMutableArrayRef cert_list =
+      CFArrayCreateMutable(kCFAllocatorDefault, 0,
+                           &kCFTypeArrayCallBacks);
+  if (!cert_list)
+    return NULL;
+
+  CFArrayAppendValue(cert_list, cert->os_cert_handle());
+  const X509Certificate::OSCertHandles& intermediates =
+      cert->GetIntermediateCertificates();
+  for (size_t i = 0; i < intermediates.size(); ++i)
+    CFArrayAppendValue(cert_list, intermediates[i]);
+
+  return cert_list;
+}
+
+}  // namespace x509_util
+
+}  // namespace net