Thanks for the tips Alexey. I suspected order was to blame and wrote a script 
to run all the LayoutTests/platform/mac/accessibility tests as tuples with the 
flaky test coming second. The winning combination that reproduces the flaky 
failure for me:

Tools/Scripts/run-webkit-tests --debug 
LayoutTests/platform/mac/accessibility/document-links.html 
LayoutTests/platform/mac/accessibility/search-predicate-element-count.html

Odd/interesting that order matters. Still chasing down the details, thanks 
again.

On Dec 3, 2013, at 3:23 PM, Alexey Proskuryakov <[email protected]> wrote:

> 
> 03 дек. 2013 г., в 14:11, Tim Horton <[email protected]> написал(а):
> 
>> It would be ideal if you could figure out *why* the test is flaky. What 
>> state are the tests that run before it setting that isn’t getting reset? Can 
>> you narrow it down to a pair of tests?
> 
> One way to do this is to run accessibility tests with "--child-processes=1 
> --verbose" options, and to start bisecting if that makes the issue reliable.
> 
> Another useful approach is to make the tests run multiple times with 
> "--child-processes=1 --verbose —repeat-each=10".
> 
> - WBR, Alexey Proskuryakov
> 
> 

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