[autofill] Sync server card and address metadata.

sync/protocol/nigori_specifics.proto

 // 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.
 //
 // Sync protocol datatype extension for nigori keys.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 110 matching lines @@
 
   // Boolean corresponding to Whether to encrypt favicons data or not.
   optional bool encrypt_favicon_images = 35;
   optional bool encrypt_favicon_tracking = 36;
 
   // Boolean corresponding to whether articles should be encrypted.
   optional bool encrypt_articles = 37;
 
   // Boolean corresponding to whether app list items should be encrypted.
   optional bool encrypt_app_list = 38;
+
+  // Boolean corresponding to whether usage count and last use date of Wallet
+  // data should be encrypted.
+  optional bool encrypt_autofill_wallet_metadata = 39;
 }