Add quarantine metadata to downloads on the Mac.

chrome/common/quarantine_mac.h

Index: chrome/common/quarantine_mac.h
===================================================================
--- chrome/common/quarantine_mac.h	(revision 0)
+++ chrome/common/quarantine_mac.h	(revision 0)
@@ -0,0 +1,22 @@
+// Copyright (c) 2009 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 CHROME_COMMON_QUARANTINE_MAC_H_
+#define CHROME_COMMON_QUARANTINE_MAC_H_
+
+class FilePath;
+class GURL;
+
+namespace quarantine_mac {
+
+// Adds quarantine metadata to the file, assuming it has already been
+// quarantined by the OS.
+// |source| should be the source URL for the download, and |referrer| should be
+// the URL the user initiated the download from.
+void AddQuarantineMetadataToFile(const FilePath& file, const GURL& source,
+                                 const GURL& referrer);
+
+}  // namespace quarantine_mac
+
+#endif  // CHROME_COMMON_QUARANTINE_MAC_H_