[tor-bugs] #28142 [Core Tor/Tor]: Merge original WTF-PAD branch

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#28142: Merge original WTF-PAD branch
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:
                                                 |  mikeperry
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  wtf-pad, tor-relay, tor-cell,        |  Actual Points:
  padding                                        |
Parent ID:  #28631                               |         Points:
 Reviewer:  asn                                  |        Sponsor:
                                                 |  Sponsor2
-------------------------------------------------+-------------------------

Comment (by mikeperry):

 Hrmm.. For monotime, I think my preference would be some kind of check
 that helps decide which of these time abstractions to use, for optimal
 accuracy and speed. I also think that its likely that the choices we make
 for client circuits will be different than for relays. I think clients can
 sacrifice more speed for accuracy, since their volumes of traffic will be
 lower.

 As for the TODO, we should drop it and make sure it is captured in the
 tickets.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28142#comment:33>
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The Tor Project: anonymity online