services/shell: Allow injecting the location of resources.

services/shell/background/background_shell.h

Index: services/shell/background/background_shell.h
diff --git a/services/shell/background/background_shell.h b/services/shell/background/background_shell.h
index 363b88bd3d77caffea278093e3bd7b7d71aaf766..e33ac68a519ccbfa7ff3c1ec4d0670676f968923 100644
--- a/services/shell/background/background_shell.h
+++ b/services/shell/background/background_shell.h
@@ -8,6 +8,7 @@
 #include <memory>
 #include <vector>
 
+#include "base/files/file_path.h"
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "services/catalog/store.h"
@@ -33,6 +34,7 @@ class BackgroundShell {
     ~InitParams();
 
     NativeRunnerDelegate* native_runner_delegate = nullptr;
+    base::FilePath::StringType override_resource_path;
     std::unique_ptr<catalog::Store> catalog_store;
     // If true the edk is initialized.
     bool init_edk = true;