Only set acquire fences on overlay layers

Change-Id: I08e8173f83580de5a4e43a0ba5ea03e5ec6e8782
diff --git a/services/surfaceflinger/LayerBase.h b/services/surfaceflinger/LayerBase.h
index fb2e9bd..83e871c 100644
--- a/services/surfaceflinger/LayerBase.h
+++ b/services/surfaceflinger/LayerBase.h
@@ -115,7 +115,7 @@
 
     virtual void setGeometry(HWComposer::HWCLayerInterface& layer);
     virtual void setPerFrameData(HWComposer::HWCLayerInterface& layer);
-
+    virtual void setAcquireFence(HWComposer::HWCLayerInterface& layer);
 
     /**
      * draw - performs some global clipping optimizations