[GPU] Store an EDRAM snapshot in traces

src/xenia/gpu/trace_player.h

@@ -61,6 +61,7 @@ class TracePlayer : public TraceReader {
   bool playing_trace_ = false;
   std::atomic<uint32_t> playback_percent_ = {0};
   std::unique_ptr<xe::threading::Event> playback_event_;
+  uint8_t* edram_snapshot_ = nullptr;
 };
 
 }  // namespace gpu