[USS] Move GetAllNodes from backend to controller

components/sync/driver/directory_data_type_controller.cc

Index: components/sync/driver/directory_data_type_controller.cc
diff --git a/components/sync/driver/directory_data_type_controller.cc b/components/sync/driver/directory_data_type_controller.cc
index 2a4c332c65080980be45b1425dd8f1bdbe41fc7d..823b5f1a546b9292fc84240264ec6d9990be85b6 100644
--- a/components/sync/driver/directory_data_type_controller.cc
+++ b/components/sync/driver/directory_data_type_controller.cc
@@ -4,14 +4,19 @@
 
 #include "components/sync/driver/directory_data_type_controller.h"
 
+#include "components/sync/core/user_share.h"
 #include "components/sync/driver/backend_data_type_configurer.h"
+#include "components/sync/driver/sync_service.h"
+#include "components/sync/syncable/syncable_read_transaction.h"
 
 namespace sync_driver {
 
 DirectoryDataTypeController::DirectoryDataTypeController(
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread,
-    const base::Closure& error_callback)
-    : DataTypeController(ui_thread, error_callback) {}
+    const base::Closure& error_callback,
+    SyncClient* sync_client)
+    : DataTypeController(ui_thread, error_callback),
+      sync_client_(sync_client) {}
 
 DirectoryDataTypeController::~DirectoryDataTypeController() {}
 
@@ -22,6 +27,17 @@ bool DirectoryDataTypeController::ShouldLoadModelBeforeConfigure() const {
   return false;
 }
 
+void DirectoryDataTypeController::GetAllNodes(
+    const AllNodesCallback& callback) {
+  std::unique_ptr<base::ListValue> node_list(new base::ListValue());
+  if (state() != DataTypeController::DISABLED) {
+    node_list = GetAllNodesForTypeFromDirectory(
+        type(),
+        sync_client_->GetSyncService()->GetUserShare()->directory.get());
+  }
+  callback.Run(type(), std::move(node_list));
+}
+
 void DirectoryDataTypeController::RegisterWithBackend(
     BackendDataTypeConfigurer* configurer) {}
 
@@ -38,4 +54,14 @@ void DirectoryDataTypeController::DeactivateDataType(
   configurer->DeactivateDirectoryDataType(type());
 }
 
+// static
+std::unique_ptr<base::ListValue>
+DirectoryDataTypeController::GetAllNodesForTypeFromDirectory(
+    syncer::ModelType type,
+    syncer::syncable::Directory* directory) {
+  DCHECK(directory);
+  syncer::syncable::ReadTransaction trans(FROM_HERE, directory);
+  return directory->GetNodeDetailsForType(&trans, type);
+}
+
 }  // namespace sync_driver