HostInterface: Move setting update logic to base class

src/core/host_interface.h

@@ -4,6 +4,7 @@
 #include "types.h"
 #include <chrono>
 #include <deque>
+#include <functional>
 #include <memory>
 #include <mutex>
 #include <optional>
@@ -85,6 +86,7 @@ protected:
     float duration;
   };
 
+  virtual void SwitchGPURenderer();
   virtual void OnPerformanceCountersUpdated();
   virtual void OnRunningGameChanged();
 
@@ -102,6 +104,8 @@ protected:
   /// Returns the path of the game database cache file.
   std::string GetGameListDatabaseFileName() const;
 
+  void UpdateSettings(const std::function<void()>& apply_callback);
+
   void RunFrame();
 
   /// Throttles the system, i.e. sleeps until it's time to execute the next frame.