Stop reporting frame stats from frames completed before observer was attached

Test: Run app from bug report
Fixes: 195699687
Change-Id: If80825dfb41467917b7b9b1e8c9ead1a0dcbffae
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index 2c299fa..8d0fcd5 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -587,6 +587,7 @@
                 "HardwareBitmapUploader.cpp",
                 "HWUIProperties.sysprop",
                 "JankTracker.cpp",
+                "FrameMetricsReporter.cpp",
                 "Layer.cpp",
                 "LayerUpdateQueue.cpp",
                 "ProfileData.cpp",