diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 7d085a4..79750a6 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -274,9 +274,10 @@
     bool onPreComposition();
 
     /*
-     *  called after composition.
+     * called after composition.
+     * returns true if the layer latched a new buffer this frame.
      */
-    void onPostComposition();
+    bool onPostComposition();
 
 #ifdef USE_HWC2
     // If a buffer was replaced this frame, release the former buffer
@@ -406,6 +407,8 @@
             bool* outIsGlesComposition, nsecs_t* outPostedTime,
             sp<Fence>* outAcquireFence, sp<Fence>* outPrevReleaseFence) const;
 
+    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
+
 protected:
     // constant
     sp<SurfaceFlinger> mFlinger;