[XAM] Added support for searching publisher paths

src/xenia/kernel/xam/content_manager.h

@@ -11,6 +11,7 @@
 #define XENIA_KERNEL_XAM_CONTENT_MANAGER_H_
 
 #include <memory>
+#include <set>
 #include <string>
 #include <unordered_map>
 #include <vector>
@@ -179,6 +180,9 @@ class ContentManager {
       const std::string_view file_name, XContentType content_type,
       uint32_t title_id = -1);
 
+  std::set<uint32_t> FindPublisherTitleIds(
+      uint32_t base_title_id = kCurrentlyRunningTitleId) const;
+
   KernelState* kernel_state_;
   std::filesystem::path root_path_;