Force encryption migration if the device supports ARC.

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 2895 matching lines @@
 const char kEnableImeMenuDescription[] =
     "Enable access to the new IME menu in the Language Settings page.";
 
 const char kEnableEhvInputName[] =
     "Emoji, handwriting and voice input on opt-in IME menu";
 
 const char kEnableEhvInputDescription[] =
     "Enable access to emoji, handwriting and voice input form opt-in IME "
     "menu.";
 
+const char kEnableEncryptionMigrationName[] =
+    "Enable encryption migration of user data";
+
+const char kEnableEncryptionMigrationDescription[] =
+    "If enabled and the device supports ARC, the user will be asked to update "
+    "the encryption of user data when the user signs in.";
+
 #endif  // #if defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions