Plumbing for getting FenceTracker timestamps

Change-Id: I1ebee9e42e28658bd3a2b161fdaabb7da756d8f3
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 0276d38..0dc04eb 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -3606,6 +3606,11 @@
     }
 }
 
+bool SurfaceFlinger::getFrameTimestamps(const Layer& layer,
+        uint64_t frameNumber, FrameTimestamps* outTimestamps) {
+    return mFenceTracker.getFrameTimestamps(layer, frameNumber, outTimestamps);
+}
+
 // ---------------------------------------------------------------------------
 
 SurfaceFlinger::LayerVector::LayerVector() {