Introduce a SetRegValueWorkItem overload that accepts a callback instead (...)

chrome/installer/util/work_item_list.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_WORK_ITEM_LIST_H_
 #define CHROME_INSTALLER_UTIL_WORK_ITEM_LIST_H_
 
 #include <windows.h>
 
 #include <list>
@@ skipping 102 matching lines @@
 
   // Add a SetRegValueWorkItem that sets a registry value with REG_QWORD type
   // at the key with specified path.
   virtual WorkItem* AddSetRegValueWorkItem(HKEY predefined_root,
                                            const std::wstring& key_path,
                                            REGSAM wow64_access,
                                            const std::wstring& value_name,
                                            int64 value_data,
                                            bool overwrite);
 
+  // Add a SetRegValueWorkItem that sets a registry value based on the value
+  // provided by |get_value_callback| given the existing value under
+  // |key_path\value_name|.
+  virtual WorkItem* AddSetRegValueWorkItem(
+      HKEY predefined_root,
+      const std::wstring& key_path,
+      REGSAM wow64_access,
+      const std::wstring& value_name,
+      const WorkItem::GetValueFromExistingCallback& get_value_callback);
+
   // Add a SelfRegWorkItem that registers or unregisters a DLL at the
   // specified path. If user_level_registration is true, then alternate
   // registration and unregistration entry point names will be used.
   virtual WorkItem* AddSelfRegWorkItem(const std::wstring& dll_path,
                                        bool do_register,
                                        bool user_level_registration);
 
  protected:
   friend class WorkItem;
 
@@ skipping 32 matching lines @@
   // Execute the WorkItems in the same order as they are added to the list.
   // If a WorkItem fails, the function will return failure but all other
   // WorkItems will still be executed.
   bool Do() override;
 
   // No-op.
   void Rollback() override;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_WORK_ITEM_LIST_H_