[tbb-bugs] #12620 [Tor Browser]: Rebase TBB patches to Firefox 31 and add unit tests

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#12620: Rebase TBB patches to Firefox 31 and add unit tests
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     Reporter:  gk       |      Owner:  tbb-team
         Type:  task     |     Status:  new
     Priority:  major    |  Milestone:
    Component:  Tor      |    Version:
  Browser                |   Keywords:  ff31-esr, tbb-rebase, tbb-firefox-
   Resolution:           |  patch, TorBrowserTeam201409D
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by mcs):

 brade and I reviewed the canvas patch (bug #6253).  Everything looks good,
 except we think it would be better to return all-white image placeholder
 data (to be compatible with the behavior of TB 3.6.x)... hence the fixup
 patch I just attached to this bug.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12620#comment:29>
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