Extend packet header with frame processing latency

src/platform/windows/misc.h

@@ -1,5 +1,7 @@
 #ifndef SUNSHINE_WINDOWS_MISC_H
 #define SUNSHINE_WINDOWS_MISC_H
+
+#include <chrono>
 #include <string_view>
 #include <windows.h>
 #include <winnt.h>
@@ -9,6 +11,12 @@ namespace platf {
   print_status(const std::string_view &prefix, HRESULT status);
   HDESK
   syncThreadDesktop();
+
+  int64_t
+  qpc_counter();
+
+  std::chrono::nanoseconds
+  qpc_time_difference(int64_t performance_counter1, int64_t performance_counter2);
 }  // namespace platf
 
 #endif