Refactor preference syncing.

chrome/browser/sync/glue/sync_backend_host.cc

 // Copyright (c) 2011 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 "build/build_config.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 497 matching lines @@
   DCHECK(i != registrar_.routing_info.end());
   DCHECK((*i).second == GROUP_PASSIVE);
   syncable::ModelType type = data_type_controller->type();
   // Change the data type's routing info to its group.
   registrar_.routing_info[type] = data_type_controller->model_safe_group();
 
   // Add the data type's change processor to the list of change
   // processors so it can receive updates.
   DCHECK_EQ(processors_.count(type), 0U);
   processors_[type] = change_processor;
+
+  // Start the change processor.
+  change_processor->Start(profile_, GetUserShare());
 }
 
 void SyncBackendHost::DeactivateDataType(
     DataTypeController* data_type_controller,
     ChangeProcessor* change_processor) {
   base::AutoLock lock(registrar_lock_);
   registrar_.routing_info.erase(data_type_controller->type());
 
+  // Stop the change processor and remove it from the list of processors.
+  change_processor->Stop();
   std::map<syncable::ModelType, ChangeProcessor*>::size_type erased =
       processors_.erase(data_type_controller->type());
   DCHECK_EQ(erased, 1U);
 }
 
 bool SyncBackendHost::RequestClearServerData() {
   core_thread_.message_loop()->PostTask(FROM_HERE,
      NewRunnableMethod(core_.get(),
      &SyncBackendHost::Core::DoRequestClearServerData));
   return true;
@@ skipping 642 matching lines @@
   DCHECK_EQ(MessageLoop::current(), host_->core_thread_.message_loop());
   syncapi_->GetJsBackend()->ProcessMessage(name, args, sender);
 }
 
 void SyncBackendHost::Core::DeferNudgeForCleanup() {
   DCHECK_EQ(MessageLoop::current(), host_->core_thread_.message_loop());
   deferred_nudge_for_cleanup_requested_ = true;
 }
 
 }  // namespace browser_sync