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: Ic0e8fdd4a2a88f54f8e6bc21c18a873c2d4d7a1c

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