Timestamp: Collect and dump statistics

Test: Audioflinger dumpsys
Bug: 80502521
Change-Id: I8c7c8b0c2f0f51dc898ed96f6a973e20490022f1
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index b691ca9..064e291 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -499,6 +499,9 @@
                 sp<NBLog::Writer>       mNBLogWriter;
                 bool                    mSystemReady;
                 ExtendedTimestamp       mTimestamp;
+                TimestampVerifier< // For timestamp statistics.
+                        int64_t /* frame count */, int64_t /* time ns */> mTimestampVerifier;
+
                 // A condition that must be evaluated by the thread loop has changed and
                 // we must not wait for async write callback in the thread loop before evaluating it
                 bool                    mSignalPending;