logd: Add TID statistics

(cherry pick from commit 17ed6797df722464eb5cc6dfc3e1e32aec284b70)

Bug: 19608965
Change-Id: Ifbf0b00c48ef12b5970b9f9f217bd1dd8f587f2c
diff --git a/logd/LogBufferElement.h b/logd/LogBufferElement.h
index bca3043..5dabaac 100644
--- a/logd/LogBufferElement.h
+++ b/logd/LogBufferElement.h
@@ -35,6 +35,7 @@
 
 // Furnished in LogStatistics.cpp. Caller must own and free returned value
 char *pidToName(pid_t pid);
+char *tidToName(pid_t tid);
 
 // Furnished in main.cpp. Thread safe.
 const char *tagToName(uint32_t tag);