godofredoc b731070351 Adds all the engine builders to the file used to validate tree status. (flutter/engine#20642)
Builders are read from a json file to get their last builds using
buildbucket and calculate the tree status. Some builders were not being
used for the tree status validation allowing rollers to land changes
even though some builders were failing.

Bug:
  https://github.com/flutter/flutter/issues/64061
2020-08-19 18:39:38 -07:00
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