[USS] Implement SharedModelTypeProcessor::GetAllNodes for USS

components/sync/driver/non_blocking_data_type_controller.cc

Index: components/sync/driver/non_blocking_data_type_controller.cc
diff --git a/components/sync/driver/non_blocking_data_type_controller.cc b/components/sync/driver/non_blocking_data_type_controller.cc
index 9cbf62ba74572151965194094227e54ec0f49cf0..0511c3d3c7d6832df1985a333a20313b9216c1e9 100644
--- a/components/sync/driver/non_blocking_data_type_controller.cc
+++ b/components/sync/driver/non_blocking_data_type_controller.cc
@@ -79,7 +79,14 @@ void NonBlockingDataTypeController::LoadModels(
 
 void NonBlockingDataTypeController::GetAllNodes(
     const AllNodesCallback& callback) {
-  callback.Run(type(), base::WrapUnique(new base::ListValue()));
+  base::WeakPtr<syncer_v2::ModelTypeService> service =
+      sync_client_->GetModelTypeServiceForType(type());
+  syncer_v2::SharedModelTypeProcessor* processor =
+      (syncer_v2::SharedModelTypeProcessor*)service->change_processor();

[skym, 2016/09/12 16:40:39]

This cast should have a TODO

[Gang Wu, 2016/09/12 22:38:04]

Done.

+  RunOnModelThread(FROM_HERE,
+                   base::Bind(&syncer_v2::SharedModelTypeProcessor::GetAllNodes,
+                              base::Unretained(processor),
+                              base::ThreadTaskRunnerHandle::Get(), callback));
 }
 
 void NonBlockingDataTypeController::LoadModelsDone(