Fix memtrack_helper for newer versions Android.

tools/android/memtrack_helper/memtrack_helper.h

Index: tools/android/memtrack_helper/memtrack_helper.h
diff --git a/tools/android/memtrack_helper/memtrack_helper.h b/tools/android/memtrack_helper/memtrack_helper.h
index df349c3c3ed6e9e05a5ee6d6c66d3d2f24480502..3334a25dd515ea5c2600ce69fafb86c260b3f45a 100644
--- a/tools/android/memtrack_helper/memtrack_helper.h
+++ b/tools/android/memtrack_helper/memtrack_helper.h
@@ -14,6 +14,7 @@
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <unistd.h>
 
 static inline void exit_with_failure(const char* reason) {
   perror(reason);
@@ -28,4 +29,10 @@ static inline void init_memtrack_server_addr(struct sockaddr_un* addr) {
   strncpy(&addr->sun_path[1], kAbstractSocketName, sizeof(addr->sun_path) - 2);
 }
 
+static inline void log_pid() {

[Primiano Tucci (use gerrit), 2016/12/14 15:51:16]

This is used only in one place, only in the .cc file.
Just add those lines there.
The deal with this file was to share code between the damon and the test client.

[kraynov, 2016/12/15 15:43:48]

Done.

+  long pid = getpid();
+  fprintf(stderr, "pid=%ld\n", pid);
+  __android_log_print(ANDROID_LOG_INFO, "memtrack_helper", "pid=%ld\n", pid);
+}
+
 #endif  // TOOLS_ANDROID_MEMTRACK_HELPER_H_