sync: Introduce ModelTypeRegistry and helpers

sync/engine/syncer.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.h"
 
 #include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 96 matching lines @@
                  kCreateMobileBookmarksFolder,
                  request_types));
   return HandleCycleEnd(session, sync_pb::GetUpdatesCallerInfo::PERIODIC);
 }
 
 void Syncer::ApplyUpdates(SyncSession* session) {
   TRACE_EVENT0("sync", "ApplyUpdates");
 
   ApplyControlDataUpdates(session->context()->directory());
 
-  UpdateHandlerMap* handler_map = session->context()->update_handler_map();
-  for (UpdateHandlerMap::iterator it = handler_map->begin();
-       it != handler_map->end(); ++it) {
-    it->second->ApplyUpdates(session->mutable_status_controller());
-  }
+  session->context()->updater_list()->ApplyUpdatesForAllTypes(
+      session->mutable_status_controller());
 
   session->context()->set_hierarchy_conflict_detected(
       session->status_controller().num_hierarchy_conflicts() > 0);
 
   session->SendEventNotification(SyncEngineEvent::STATUS_CHANGED);
 }
 
 bool Syncer::DownloadAndApplyUpdates(
     ModelTypeSet request_types,
     SyncSession* session,
@@ skipping 23 matching lines @@
 
 SyncerError Syncer::BuildAndPostCommits(ModelTypeSet requested_types,
                                         sessions::SyncSession* session) {
   // The ExitRequested() check is unnecessary, since we should start getting
   // errors from the ServerConnectionManager if an exist has been requested.
   // However, it doesn't hurt to check it anyway.
   while (!ExitRequested()) {
     scoped_ptr<Commit> commit(
         Commit::Init(
             requested_types,
+            session->context()->enabled_types(),
             session->context()->max_commit_batch_size(),
             session->context()->account_name(),
             session->context()->directory()->cache_guid(),
-            session->context()->commit_contributor_map(),
+            session->context()->committer_list(),
             session->context()->extensions_activity()));
     if (!commit) {
       break;
     }
 
     SyncerError error = commit->PostAndProcessResponse(
         session,
         session->mutable_status_controller(),
         session->context()->extensions_activity());
     commit->CleanUp();
@@ skipping 15 matching lines @@
     sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source) {
   if (!ExitRequested()) {
     session->SendSyncCycleEndEventNotification(source);
     return true;
   } else {
     return false;
   }
 }
 
 }  // namespace syncer