[USS] Change the place where SharedModelTypeProcessor got created

sync/internal_api/public/test/fake_model_type_service.h

Index: sync/internal_api/public/test/fake_model_type_service.h
diff --git a/sync/internal_api/public/test/fake_model_type_service.h b/sync/internal_api/public/test/fake_model_type_service.h
index 966680a9a796ad36bd90c55b41f0fb03d0330c18..99f9c0461684f108777f5642bad43b8f13f9adcd 100644
--- a/sync/internal_api/public/test/fake_model_type_service.h
+++ b/sync/internal_api/public/test/fake_model_type_service.h
@@ -42,6 +42,25 @@ class FakeModelTypeService
   std::string GetClientTag(const EntityData& entity_data) override;
 
   void OnChangeProcessorSet() override;
+
+  syncer::ModelType type() const override;
+
+  // TODO(gangwu): remove this and use overload constructor.
+  base::WeakPtr<SharedModelTypeProcessor> SetUpProcessor(
+      ModelTypeChangeProcessor* processor);
+
+ protected:
+  // The function will create ModelTypeChangeProcessor.
+  virtual ModelTypeChangeProcessor* CreateProcessorForTest(
+      syncer::ModelType type,
+      ModelTypeService* service);
+
+ private:
+  scoped_ptr<ModelTypeChangeProcessor> CreateProcessorForTestWrapper(
+      syncer::ModelType type,
+      ModelTypeService* service);
+
+  syncer_v2::ModelTypeChangeProcessor* processor_;
 };
 
 }  // namespace syncer_v2