tracing service: improve logging for --save-for-bugreport am: f3f948836e
tracing service: improve logging for --save-for-bugreport am: f3f948836e

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/perfetto/+/15059758

Change-Id: Iea01d0305955b5e87730a1d91aaa15c9573b6aa1

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto