diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 9686259..b3fa5e7 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -34,6 +34,7 @@
 #include "LayerBase.h"
 #include "SurfaceTextureLayer.h"
 #include "Transform.h"
+#include <utils/Timers.h>
 
 namespace android {
 
@@ -86,6 +87,7 @@
 protected:
     virtual void onFirstRef();
     virtual void dump(String8& result, char* scratch, size_t size) const;
+    virtual void dumpStats(String8& result, char* buffer, size_t SIZE) const;
 
 private:
     friend class SurfaceTextureLayer;
@@ -114,7 +116,14 @@
     bool mCurrentOpacity;
     bool mFrameLatencyNeeded;
     int mFrameLatencyOffset;
-    int64_t mFrameLatencies[128];
+    struct Statistics {
+        Statistics() : timestamp(0), set(0), vsync(0) { }
+        nsecs_t timestamp;  // buffer timestamp
+        nsecs_t set;        // buffer displayed timestamp
+        nsecs_t vsync;      // vsync immediately before set
+    };
+    // protected by mLock
+    Statistics mFrameStats[128];
 
     // constants
     PixelFormat mFormat;
@@ -126,9 +135,6 @@
     bool mSecure;         // no screenshots
     bool mProtectedByApp; // application requires protected path to external sink
     Region mPostedDirtyRegion;
-
-    // binder thread, transaction thread
-    mutable Mutex mLock;
 };
 
 // ---------------------------------------------------------------------------