message: Switch "activity type is not supported" log to a VLOG.
  This log message can occur with high frequency.  For example, cudaEventRecord
  (36) is not supported.
diff: @@ -1919,7 +1919,7 @@ Status CuptiTracer::ProcessActivityBuffer(CUcontext context, uint32_t stream_id,
  reinterpret_cast<CUpti_ActivitySynchronization *>(record));
  break;
  default:
  - LOG(ERROR) << "Activity type " << record->kind << " not supported.";
  + VLOG(3) << "Activity type " << record->kind << " is not supported.";
  break;
  }
  } else if (status == CUPTI_ERROR_MAX_LIMIT_REACHED) {
  