USS SyncContextProxy / data type activation refactoring

sync/sessions/model_type_registry.cc

Index: sync/sessions/model_type_registry.cc
diff --git a/sync/sessions/model_type_registry.cc b/sync/sessions/model_type_registry.cc
index f0375f7b2092858dd20f0b0449c155b43f6b345c..3d47b6db698ff4175fe7fc41373efbcef21796c0 100644
--- a/sync/sessions/model_type_registry.cc
+++ b/sync/sessions/model_type_registry.cc
@@ -188,30 +188,30 @@ void ModelTypeRegistry::SetEnabledDirectoryTypes(
 
 void ModelTypeRegistry::ConnectSyncTypeToWorker(
     ModelType type,
-    const syncer_v2::DataTypeState& data_type_state,
-    const syncer_v2::UpdateResponseDataList& saved_pending_updates,
-    const scoped_refptr<base::SequencedTaskRunner>& type_task_runner,
-    const base::WeakPtr<syncer_v2::ModelTypeProcessor>& type_processor) {
+    scoped_ptr<syncer_v2::ActivationContext> activation_context) {
   DVLOG(1) << "Enabling an off-thread sync type: " << ModelTypeToString(type);
 
   // Initialize Worker -> Processor communication channel.
   scoped_ptr<syncer_v2::ModelTypeProcessor> processor_proxy(
-      new ModelTypeProcessorProxy(type_processor, type_task_runner));
+      new ModelTypeProcessorProxy(activation_context->type_processor,
+                                  activation_context->type_task_runner));
   scoped_ptr<Cryptographer> cryptographer_copy;
   if (encrypted_types_.Has(type))
     cryptographer_copy.reset(new Cryptographer(*cryptographer_));
 
   scoped_ptr<syncer_v2::ModelTypeWorker> worker(new syncer_v2::ModelTypeWorker(
-      type, data_type_state, saved_pending_updates, cryptographer_copy.Pass(),
+      type, activation_context->data_type_state,
+      activation_context->saved_pending_updates, cryptographer_copy.Pass(),
       nudge_handler_, processor_proxy.Pass()));
 
   // Initialize Processor -> Worker communication channel.
   scoped_ptr<syncer_v2::CommitQueue> commit_queue_proxy(new CommitQueueProxy(
       worker->AsWeakPtr(), scoped_refptr<base::SequencedTaskRunner>(
                                base::ThreadTaskRunnerHandle::Get())));
-  type_task_runner->PostTask(
+  activation_context->type_task_runner->PostTask(
       FROM_HERE, base::Bind(&syncer_v2::ModelTypeProcessor::OnConnect,
-                            type_processor, base::Passed(&commit_queue_proxy)));
+                            activation_context->type_processor,
+                            base::Passed(&commit_queue_proxy)));
 
   DCHECK(update_handler_map_.find(type) == update_handler_map_.end());
   DCHECK(commit_contributor_map_.find(type) == commit_contributor_map_.end());