buffet: Read config/state paths from commandline

This allows us to use custom paths and configurations in test without
altering normal system operation.

BUG=brillo:172
TEST=unittests

Change-Id: I1a969093683205d5f600ff88ebba8b22c05368b4
Reviewed-on: https://chromium-review.googlesource.com/247504
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
diff --git a/buffet/manager.h b/buffet/manager.h
index ab5171f..c0086ed 100644
--- a/buffet/manager.h
+++ b/buffet/manager.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 <base/values.h>
@@ -47,6 +48,8 @@
   ~Manager();
 
   void RegisterAsync(
+      const base::FilePath& config_path,
+      const base::FilePath& state_path,
       const chromeos::dbus_utils::AsyncEventSequencer::CompletionAction& cb);
 
  private: