SF: FrameBuckets state to SFBE

Move FrameBuckets state to SurfaceFlingerBE

Test: build
Change-Id: Ib44ab2dc189e0ba31ab8ec5a157c9c3b7cd9808a
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 419d69d..85cba98 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -154,6 +154,11 @@
     };
     std::queue<CompositePresentTime> mCompositePresentTimes;
 
+    static const size_t NUM_BUCKETS = 8; // < 1-7, 7+
+    nsecs_t mFrameBuckets[NUM_BUCKETS];
+    nsecs_t mTotalTime;
+    std::atomic<nsecs_t> mLastSwapTime;
+
     // Double- vs. triple-buffering stats
     struct BufferingStats {
         BufferingStats()
@@ -785,10 +790,6 @@
 
     // Static screen stats
     bool mHasPoweredOff;
-    static const size_t NUM_BUCKETS = 8; // < 1-7, 7+
-    nsecs_t mFrameBuckets[NUM_BUCKETS];
-    nsecs_t mTotalTime;
-    std::atomic<nsecs_t> mLastSwapTime;
 
     size_t mNumLayers;