Frontends: Add frame time performance counters

src/core/host_interface.h

@@ -72,6 +72,10 @@ protected:
     float duration;
   };
 
+  virtual void OnPerformanceCountersUpdated();
+
+  void RunFrame();
+
   /// Throttles the system, i.e. sleeps until it's time to execute the next frame.
   void Throttle();
 
@@ -95,18 +99,24 @@ protected:
   Common::Timer m_throttle_timer;
   Common::Timer m_speed_lost_time_timestamp;
 
+  bool m_paused = false;
+  bool m_speed_limiter_temp_disabled = false;
+  bool m_speed_limiter_enabled = false;
+
+  float m_average_frame_time_accumulator = 0.0f;
+  float m_worst_frame_time_accumulator = 0.0f;
+
   float m_vps = 0.0f;
   float m_fps = 0.0f;
   float m_speed = 0.0f;
+  float m_worst_frame_time = 0.0f;
+  float m_average_frame_time = 0.0f;
   u32 m_last_frame_number = 0;
   u32 m_last_internal_frame_number = 0;
   u32 m_last_global_tick_counter = 0;
   Common::Timer m_fps_timer;
+  Common::Timer m_frame_timer;
 
   std::deque<OSDMessage> m_osd_messages;
   std::mutex m_osd_messages_lock;
-
-  bool m_paused = false;
-  bool m_speed_limiter_temp_disabled = false;
-  bool m_speed_limiter_enabled = false;
 };