[Win] Add option to reauthenticate the OS user before revealing passwords.

chrome/common/pref_names.cc

 // Copyright (c) 2012 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 "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
 namespace prefs {
@@ skipping 2599 matching lines @@
 
 #if defined(OS_ANDROID)
 // A list of partner bookmark rename/remove mappings.
 // Each list item is a dictionary containing a "url", a "provider_title" and
 // "mapped_title" entries, detailing the bookmark target URL (if any), the title
 // given by the PartnerBookmarksProvider and either the user-visible renamed
 // title or an empty string if the bookmark node was removed.
 const char kPartnerBookmarkMappings[] = "partnerbookmarks.mappings";
 #endif
 
+#if defined(OS_WIN)
+// Whether the password was blank, only valid if OS password was last changed
+// on or before the value contained in kOsPasswordLastChanged.
+const char kOsPasswordBlank[] = "password_manager.os_password_blank";
+
+// The number of seconds since epoch that the OS password was last changed.
+const char kOsPasswordLastChanged[] =
+    "password_manager.os_password_last_changed";
+#endif
 }  // namespace prefs