sync: Move migration signal out of snapshot

sync/engine/syncer_proto_util.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/syncer_proto_util.h"
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "google_apis/google_api_keys.h"
 #include "sync/engine/net/server_connection_manager.h"
@@ skipping 444 matching lines @@
         session->delegate()->OnTypesThrottled(
             sync_protocol_error.error_data_types,
             GetThrottleDelay(*response));
       }
       return SERVER_RETURN_THROTTLED;
     case TRANSIENT_ERROR:
       return SERVER_RETURN_TRANSIENT_ERROR;
     case MIGRATION_DONE:
       LOG_IF(ERROR, 0 >= response->migrated_data_type_id_size())
           << "MIGRATION_DONE but no types specified.";
-      // TODO(akalin): This should be a set union.
-      session->mutable_status_controller()->
-          set_types_needing_local_migration(GetTypesToMigrate(*response));
+      session->delegate()->OnReceivedMigrationRequest(
+          GetTypesToMigrate(*response));
       return SERVER_RETURN_MIGRATION_DONE;
     case CLEAR_PENDING:
       return SERVER_RETURN_CLEAR_PENDING;
     case NOT_MY_BIRTHDAY:
       return SERVER_RETURN_NOT_MY_BIRTHDAY;
     case DISABLED_BY_ADMIN:
       return SERVER_RETURN_DISABLED_BY_ADMIN;
     default:
       NOTREACHED();
       return UNSET;
@@ skipping 96 matching lines @@
 std::string SyncerProtoUtil::ClientToServerResponseDebugString(
     const ClientToServerResponse& response) {
   // Add more handlers as needed.
   std::string output;
   if (response.has_get_updates())
     output.append(GetUpdatesResponseString(response.get_updates()));
   return output;
 }
 
 }  // namespace syncer