services/shell: Allow injecting the location of resources.

services/shell/standalone/context.cc

Index: services/shell/standalone/context.cc
diff --git a/services/shell/standalone/context.cc b/services/shell/standalone/context.cc
index 03c4062ce85c07dea824b6f3086617bb15bc4ee0..be5ba8a9785fb48ae40bd18f4c70a4ab81b64601 100644
--- a/services/shell/standalone/context.cc
+++ b/services/shell/standalone/context.cc
@@ -166,6 +166,8 @@ void Context::Init(std::unique_ptr<InitParams> init_params) {
     store = std::move(init_params->catalog_store);
   catalog_.reset(
       new catalog::Catalog(blocking_pool_.get(), std::move(store), nullptr));
+  if (!init_params->override_resource_path.empty())
+    catalog_->set_override_resource_path(init_params->override_resource_path);
   service_manager_.reset(new ServiceManager(std::move(runner_factory),
                                             catalog_->TakeService()));