PERFETTO_EXPORT PacketStreamValidator
PERFETTO_EXPORT PacketStreamValidator

The previous CL (aosp/1116517) omitted the export and that
makes chrome component builds fail.

Bug: 132880619
Change-Id: I546b86aa231997fd3cca36eb02c5ef66f6822879
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto