Add velocity to timestamp filter

This lets us track better, but doesn't fix our out of order problem at
runtime.

Change-Id: I1b586258616f8f3534a09713e221cb6c73f9ee96
diff --git a/aos/network/BUILD b/aos/network/BUILD
index 65dac75..e3014fc 100644
--- a/aos/network/BUILD
+++ b/aos/network/BUILD
@@ -361,6 +361,7 @@
     hdrs = ["timestamp_filter.h"],
     deps = [
         "//aos/time",
+        "@com_google_absl//absl/strings",
     ],
 )