Add plotting script for looking at time estimation

Change-Id: Ifedf7d21c892be93c39daab76dec523a6814dd45
diff --git a/aos/events/logging/logger.cc b/aos/events/logging/logger.cc
index 9da790a..d4f4abd 100644
--- a/aos/events/logging/logger.cc
+++ b/aos/events/logging/logger.cc
@@ -1243,6 +1243,15 @@
 
   if (FLAGS_timestamps_to_csv) {
     filters_->Start(event_loop_factory);
+    std::fstream s("/tmp/timestamp_noncausal_starttime.csv", s.trunc | s.out);
+    CHECK(s.is_open());
+    for (std::unique_ptr<State> &state : states_) {
+      s << state->event_loop()->node()->name()->string_view() << ", "
+        << std::setprecision(12) << std::fixed
+        << chrono::duration<double>(state->monotonic_now().time_since_epoch())
+               .count()
+        << "\n";
+    }
   }
 }