Force encryption migration if the device supports ARC.

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 01081dfa3c51b068687e20163c994d3edb4367d1..f2f76b8e7d4398eacc3e1c87476266019c360b32 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2913,6 +2913,13 @@ 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