Implement a bag of chips for sync.

sync/engine/store_timestamps_command.cc

 // 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.
 
 #include "sync/engine/store_timestamps_command.h"
 
+#include "sync/engine/syncer_proto_util.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/sessions/status_controller.h"
 #include "sync/sessions/sync_session.h"
 #include "sync/syncable/directory.h"
 
 namespace syncer {
 
 StoreTimestampsCommand::StoreTimestampsCommand() {}
 StoreTimestampsCommand::~StoreTimestampsCommand() {}
 
 SyncerError StoreTimestampsCommand::ExecuteImpl(
     sessions::SyncSession* session) {
   syncable::Directory* dir = session->context()->directory();
 
-  const sync_pb::GetUpdatesResponse& updates =
-      session->status_controller().updates_response().get_updates();
+  const sync_pb::ClientToServerResponse& response =
+      session->status_controller().updates_response();
+  const sync_pb::GetUpdatesResponse& updates = response.get_updates();
 
   sessions::StatusController* status = session->mutable_status_controller();
 
+  // Persist a bag of chips if it has been sent by the server.
+  SyncerProtoUtil::PersistBagOfChips(dir, response);
+
   // Update the progress marker tokens from the server result.  If a marker
   // was omitted for any one type, that indicates no change from the previous
   // state.
   ModelTypeSet forward_progress_types;
   for (int i = 0; i < updates.new_progress_marker_size(); ++i) {
     ModelType model =
         GetModelTypeFromSpecificsFieldNumber(
             updates.new_progress_marker(i).data_type_id());
     if (model == UNSPECIFIED || model == TOP_LEVEL_FOLDER) {
       NOTREACHED() << "Unintelligible server response.";
@@ skipping 14 matching lines @@
   if (updates.has_changes_remaining()) {
     int64 changes_left = updates.changes_remaining();
     DVLOG(1) << "Changes remaining: " << changes_left;
     status->set_num_server_changes_remaining(changes_left);
   }
 
   return SYNCER_OK;
 }
 
 }  // namespace syncer