services/shell: Allow injecting the location of resources.

services/catalog/catalog.h

Index: services/catalog/catalog.h
diff --git a/services/catalog/catalog.h b/services/catalog/catalog.h
index 7afced34b8ff0ac07c1c2cded4bca51ab7eb4a34..345b85baf7e75946e655ce0194ad010631d89941 100644
--- a/services/catalog/catalog.h
+++ b/services/catalog/catalog.h
@@ -9,6 +9,7 @@
 #include <memory>
 #include <string>
 
+#include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/filesystem/public/interfaces/directory.mojom.h"
@@ -57,6 +58,11 @@ class Catalog : public shell::Service,
 
   shell::mojom::ServicePtr TakeService();
 
+  void set_override_resource_path(
+      const base::FilePath::StringType& resource_path) {
+    override_resource_path_ = resource_path;
+  }
+
  private:
   explicit Catalog(std::unique_ptr<Store> store);
 
@@ -94,6 +100,7 @@ class Catalog : public shell::Service,
   EntryCache system_cache_;
   bool loaded_ = false;
 
+  base::FilePath::StringType override_resource_path_;
   scoped_refptr<filesystem::LockTable> lock_table_;
 
   base::WeakPtrFactory<Catalog> weak_factory_;