logd: Add pidToUid helper

Change-Id: I23ebae1957c027bff6cbc2573a227bf0c44c08a2
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index 4a57435..12c68d5 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -172,6 +172,7 @@
 
     // helper
     static char *pidToName(pid_t pid) { return PidStatistics::pidToName(pid); }
+    uid_t pidToUid(pid_t pid);
 };
 
 #endif // _LOGD_LOG_STATISTICS_H__