trace_processor: fix counter values best index logic am: 202c12e4ab am: 31b59abb38
trace_processor: fix counter values best index logic am: 202c12e4ab
am: 31b59abb38

Change-Id: I171828c9b2c968ed6688a3079e89407dcb08168c

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