services/shell: Allow injecting the location of resources.

ui/views/mus/aura_init.cc

Index: ui/views/mus/aura_init.cc
diff --git a/ui/views/mus/aura_init.cc b/ui/views/mus/aura_init.cc
index 2d0981b9e1aaafa8790fadb890dec96ee9362e78..4543c269bc5344d938770aec38381baab1888211 100644
--- a/ui/views/mus/aura_init.cc
+++ b/ui/views/mus/aura_init.cc
@@ -74,17 +74,26 @@ void AuraInit::InitializeResources(shell::Connector* connector) {
   if (ui::ResourceBundle::HasSharedInstance())
     return;
 
+#if 0
   std::set<std::string> resource_paths({resource_file_});
   if (!resource_file_200_.empty())
     resource_paths.insert(resource_file_200_);
+#else
+  std::set<std::string> resource_paths({
+      "chrome_100_percent.pak", "chrome_200_percent.pak", "resources.pak",
+  });
+#endif
+
+  resource_file_ = "chrome_100_percent.pak";
+  resource_file_200_ = "chrome_200_percent.pak";
 
   catalog::ResourceLoader loader;
   filesystem::mojom::DirectoryPtr directory;
   connector->ConnectToInterface("mojo:catalog", &directory);
   CHECK(loader.OpenFiles(std::move(directory), resource_paths));
   ui::RegisterPathProvider();
-  base::File pak_file = loader.TakeFile(resource_file_);
-  base::File pak_file_2 = pak_file.Duplicate();
+  base::File pak_file = loader.TakeFile("resources.pak");
+  base::File pak_file_2 = loader.TakeFile("chrome_100_percent.pak");
   ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(
       std::move(pak_file), base::MemoryMappedFile::Region::kWholeFile);
   ui::ResourceBundle::GetSharedInstance().AddDataPackFromFile(