arc: Create sync protos for Arc package.

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";
 
 option optimize_for = LITE_RUNTIME;
 option retain_unknown_fields = true;
 
 package sync_pb;
 
 import "app_list_specifics.proto";
 import "app_notification_specifics.proto";
 import "app_setting_specifics.proto";
 import "app_specifics.proto";
+import "arc_package_specifics.proto";
 import "article_specifics.proto";
 import "attachments.proto";
 import "autofill_specifics.proto";
 import "bookmark_specifics.proto";
 import "client_commands.proto";
 import "client_debug_info.proto";
 import "device_info_specifics.proto";
 import "dictionary_specifics.proto";
 import "encryption.proto";
 import "experiments_specifics.proto";
@@ skipping 96 matching lines @@
   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;
+  optional ArcPackageSpecifics arc_package = 340906;
 }
 
 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 881 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;
 };