[USS] Move GetAllNodes from backend to controller

components/browser_sync/browser/profile_sync_service.cc

Index: components/browser_sync/browser/profile_sync_service.cc
diff --git a/components/browser_sync/browser/profile_sync_service.cc b/components/browser_sync/browser/profile_sync_service.cc
index a23b37b70282cccb5645fae0277583df6e174878..bc5323b600ef6d6c9c309c9be0aee97ed423fe20 100644
--- a/components/browser_sync/browser/profile_sync_service.cc
+++ b/components/browser_sync/browser/profile_sync_service.cc
@@ -61,6 +61,7 @@
 #include "components/sync/driver/backend_migrator.h"
 #include "components/sync/driver/change_processor.h"
 #include "components/sync/driver/data_type_controller.h"
+#include "components/sync/driver/directory_data_type_controller.h"
 #include "components/sync/driver/glue/chrome_report_unrecoverable_error.h"
 #include "components/sync/driver/glue/sync_backend_host.h"
 #include "components/sync/driver/glue/sync_backend_host_impl.h"
@@ -81,6 +82,7 @@
 #include "components/sync/js/js_event_details.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "components/sync/syncable/directory.h"
+#include "components/sync/syncable/syncable_read_transaction.h"
 #include "components/sync_sessions/favicon_cache.h"
 #include "components/sync_sessions/session_data_type_controller.h"
 #include "components/sync_sessions/sessions_sync_manager.h"
@@ -2283,8 +2285,8 @@ void ProfileSyncService::GetAllNodes(
     }
     helper->OnReceivedNodesForTypes(type_vector, std::move(empty_results));
   } else {
-    backend_->GetAllNodesForTypes(
-        all_types,
+    GetAllNodesForTypes(
+        all_types, base::ThreadTaskRunnerHandle::Get(),
         base::Bind(&GetAllNodesRequestHelper::OnReceivedNodesForTypes, helper));
   }
 }
@@ -2540,3 +2542,31 @@ void ProfileSyncService::OnSetupInProgressHandleDestroyed() {
     ReconfigureDatatypeManager();
   NotifyObservers();
 }
+
+void ProfileSyncService::GetAllNodesForTypes(
+    syncer::ModelTypeSet types,
+    scoped_refptr<base::SequencedTaskRunner> task_runner,
+    base::Callback<void(const std::vector<syncer::ModelType>& type,
+                        ScopedVector<base::ListValue>)> callback) {
+  std::vector<syncer::ModelType> types_vector;
+  ScopedVector<base::ListValue> node_lists;
+
+  for (syncer::ModelTypeSet::Iterator it = types.First(); it.Good(); it.Inc()) {
+    DataTypeController::TypeMap::const_iterator iter =
+        data_type_controllers_.find(it.Get());
+    if (iter != data_type_controllers_.end()) {
+      iter->second->GetAllNodes(base::ThreadTaskRunnerHandle::Get(), callback);
+    } else {
+      // Control Types
+      types_vector.push_back(it.Get());
+      node_lists.push_back(sync_driver::DirectoryDataTypeController::
+                               GetAllNodesForTypeFromDirectory(
+                                   it.Get(), GetUserShare()->directory.get())
+                                   .release());
+    }
+  }
+
+  if (!types_vector.empty()) {
+    callback.Run(types_vector, std::move(node_lists));
+  }
+}