[sync] Add WalletMetadataSpecifics protobuf.

sync/protocol/sync.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 for communication between sync client and server.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 55 matching lines @@
 message EntitySpecifics {
   // If a datatype is encrypted, this field will contain the encrypted
   // original EntitySpecifics. The extension for the datatype will continue
   // to exist, but contain only the default values.
   // Note that currently passwords employ their own legacy encryption scheme and
   // do not use this field.
   optional EncryptedData encrypted = 1;
 
   // To add new datatype-specific fields to the protocol, extend
   // EntitySpecifics.  First, pick a non-colliding tag number by
-  // picking a revision number of one of your past commits
+  // picking a Cr-Commit-Position of one of your past commits
   // to src.chromium.org.  Then, in a different protocol buffer
   // definition, define your message type, and add an optional field
   // to the list below using the unique tag value you selected.
   //
   //  optional MyDatatypeSpecifics my_datatype = 32222;
   //
   // where:
   //   - 32222 is the non-colliding tag number you picked earlier.
   //   - MyDatatypeSpecifics is the type (probably a message type defined
   //     in your new .proto file) that you want to associate with each
@@ skipping 39 matching lines @@
   optional FaviconImageSpecifics favicon_image = 182019;
   optional ManagedUserSettingSpecifics managed_user_setting = 186662;
   optional ManagedUserSpecifics managed_user = 194582;
   optional ManagedUserSharedSettingSpecifics managed_user_shared_setting =
       202026;
   optional ManagedUserWhitelistSpecifics managed_user_whitelist = 306060;
   optional ArticleSpecifics article = 223759;
   optional AppListSpecifics app_list = 229170;
   optional WifiCredentialSpecifics wifi_credential = 218175;
   optional AutofillWalletSpecifics autofill_wallet = 306270;
+  optional WalletMetadataSpecifics wallet_metadata = 330441;
 }
 
 message SyncEntity {
   // This item's identifier.  In a commit of a new item, this will be a
   // client-generated ID.  If the commit succeeds, the server will generate
   // a globally unique ID and return it to the committing client in the
   // CommitResponse.EntryResponse.  In the context of a GetUpdatesResponse,
   // |id_string| is always the server generated ID.  The original
   // client-generated ID is preserved in the |originator_client_id| field.
   // Present in both GetUpdatesResponse and CommitMessage.
@@ skipping 844 matching lines @@
 };
 
 // A message indicating that the sync engine has been disabled on a client.
 message SyncDisabledEvent {
   // The GUID that identifies the sync client.
   optional string cache_guid = 1;
 
   // The store birthday that the client was using before disabling sync.
   optional string store_birthday = 2;
 };