trace_processor: fix reentrant calls to RUN_METRIC am: a6fca4a26e am: 7bedf62ab4
trace_processor: fix reentrant calls to RUN_METRIC am: a6fca4a26e
am: 7bedf62ab4

Change-Id: I74fc312a9ff9fd6b56f901e14a49d2bfdb7081c1

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