Android systrace: Optimize memory dumps.

systrace/atrace_helper/jni/logging.h

Index: systrace/atrace_helper/jni/logging.h
diff --git a/systrace/atrace_helper/jni/logging.h b/systrace/atrace_helper/jni/logging.h
index 4acaf2c44966fd4f6f6be260dba572af115b260a..11a760cfcc80c6f11c5a08b42cbfa6e8a8a070ca 100644
--- a/systrace/atrace_helper/jni/logging.h
+++ b/systrace/atrace_helper/jni/logging.h
@@ -6,8 +6,10 @@
 #define LOGGING_H_
 
 #include <android/log.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 
 #define CHECK_ARGS(COND, ERR)                                          \
   "FAILED CHECK(%s) @ %s:%d (errno: %s)\n", #COND, __FILE__, __LINE__, \
@@ -31,4 +33,10 @@ inline void LogError(const char* message) {
   fflush(stderr);
 }
 
+inline uint64_t GetTimestamp() {
+  struct timespec ts = {};
+  CHECK(clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) == 0);
+  return ts.tv_sec * 1000 + ts.tv_nsec / 1000000ul;
+}
+
 #endif  // LOGGING_H_