Added CopyRegKeyWorkItem in support of IE low rights policy fixes.

chrome/installer/util/copy_reg_key_work_item.h

Index: chrome/installer/util/copy_reg_key_work_item.h
diff --git a/chrome/installer/util/copy_reg_key_work_item.h b/chrome/installer/util/copy_reg_key_work_item.h
new file mode 100644
index 0000000000000000000000000000000000000000..b1d463100d1caec2488e530bac2539fb979304ba
--- /dev/null
+++ b/chrome/installer/util/copy_reg_key_work_item.h
@@ -0,0 +1,51 @@
+// 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_COPY_REG_KEY_WORK_ITEM_H_
+#define CHROME_INSTALLER_UTIL_COPY_REG_KEY_WORK_ITEM_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/installer/util/registry_key_backup.h"
+#include "chrome/installer/util/work_item.h"
+
+// A WorkItem subclass that replaces the contents of one registry key with that
+// of another (i.e., the destination is erased prior to the copy).  Be aware
+// that in the event of rollback the destination key's values and subkeys are
+// restored but the key and its subkeys take on their default security
+// descriptors.
+class CopyRegKeyWorkItem : public WorkItem {
+ public:
+  virtual ~CopyRegKeyWorkItem();
+  virtual bool Do() OVERRIDE;
+  virtual void Rollback() OVERRIDE;
+
+ private:
+  friend class WorkItem;
+
+  // Neither |source_key_path| nor |dest_key_path| may be empty.
+  CopyRegKeyWorkItem(HKEY predefined_key,
+                     const std::wstring& source_key_path,
+                     const std::wstring& dest_key_path);
+
+  // Root key in which we operate. The root key must be one of the predefined
+  // keys on Windows.
+  HKEY predefined_root_;
+
+  // Path of the key to be copied.
+  std::wstring source_key_path_;
+
+  // Path of the destination key.
+  std::wstring dest_key_path_;
+
+  // Backup of the destination key.
+  RegistryKeyBackup backup_;
+
+  DISALLOW_COPY_AND_ASSIGN(CopyRegKeyWorkItem);
+};
+
+#endif  // CHROME_INSTALLER_UTIL_COPY_REG_KEY_WORK_ITEM_H_