Add some options to macrobench

Change-Id: If8d5f5d3ace050577986a554182b2b66fd2257e1
diff --git a/libs/hwui/JankTracker.cpp b/libs/hwui/JankTracker.cpp
index eb9b55f..c305f65 100644
--- a/libs/hwui/JankTracker.cpp
+++ b/libs/hwui/JankTracker.cpp
@@ -243,6 +243,7 @@
     dprintf(fd, "\nTotal frames rendered: %u", data->totalFrameCount);
     dprintf(fd, "\nJanky frames: %u (%.2f%%)", data->jankFrameCount,
             (float) data->jankFrameCount / (float) data->totalFrameCount * 100.0f);
+    dprintf(fd, "\n50th percentile: %ums", findPercentile(data, 50));
     dprintf(fd, "\n90th percentile: %ums", findPercentile(data, 90));
     dprintf(fd, "\n95th percentile: %ums", findPercentile(data, 95));
     dprintf(fd, "\n99th percentile: %ums", findPercentile(data, 99));