input testing

apps/RenderCadenceCompositor/frames/InputFrameMailbox.h

@@ -4,6 +4,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <chrono>
 #include <deque>
 #include <mutex>
 #include <vector>
@@ -48,6 +49,8 @@ struct InputFrameMailboxMetrics
 	uint64_t submitMisses = 0;
 	uint64_t consumeMisses = 0;
 	uint64_t latestFrameIndex = 0;
+	bool hasSubmittedFrame = false;
+	double latestFrameAgeMilliseconds = 0.0;
 };
 
 class InputFrameMailbox
@@ -84,4 +87,5 @@ private:
 	std::vector<Slot> mSlots;
 	std::deque<std::size_t> mReadyIndices;
 	InputFrameMailboxMetrics mCounters;
+	std::chrono::steady_clock::time_point mLatestSubmitTime;
 };