Added CopyRegKeyWorkItem in support of IE low rights policy fixes.

chrome/installer/util/registry_key_backup.h

+// 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.
+
+#ifndef CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_
+#define CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_
+#pragma once
+
+#include <windows.h>
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace base {
+namespace win {
+class RegKey;
+}

[erikwright (departed), 2011/09/15 18:38:57]

}  // namespace win
}  // namespace base

[grt (UTC plus 2), 2011/09/16 17:45:45]

Done.

+}
+
+// A container for a registry key, its values, and its subkeys.  We don't use
+// more obvious methods for various reasons:
+// - RegCopyTree isn't supported pre-Vista, so we'd have to do something
+//   different for XP anyway.
+// - SHCopyKey can't copy subkeys into a volatile destination, so we'd have to
+//   worry about polluting the registry.
+// We don't persist security attributes since we only delete keys that we own,
+// and we don't set custom attributes on them anyway.
+class RegistryKeyBackup {
+ public:
+  RegistryKeyBackup();
+  ~RegistryKeyBackup();
+
+  // Backs up |key| into this instance.  Returns true if the backup was
+  // successful; false otherwise, in which case the state of this instance is
+  // not modified.
+  bool Initialize(const base::win::RegKey& key);
+
+  // Writes the contents of this instance into |key|.
+  bool WriteTo(base::win::RegKey* key) const;
+
+ private:
+  class RegistryValueBackup;
+
+  scoped_array<RegistryValueBackup> values_;
+  scoped_array<std::wstring> subkey_names_;
+  scoped_array<RegistryKeyBackup> subkeys_;
+  DWORD num_values_;
+  DWORD num_subkeys_;
+
+  DISALLOW_COPY_AND_ASSIGN(RegistryKeyBackup);
+};
+
+#endif  // CHROME_INSTALLER_UTIL_REGISTRY_KEY_BACKUP_H_