Our valgrind builds are implemented by this script: https://dxr.mozilla.org/build-central/source/tools/scripts/valgrind/valgrind.sh We need to migrate these builds over to taskcluster. I don't think we need to try and reuse the script itself, it's a good point of reference though.
As a point of reference, the builders are currently added here http://hg.mozilla.org/build/buildbotcustom/file/tip/misc.py#l1871
I think this is done. Any status update?
Valgrind builds on taskcluster are now running on inbound. Work history can be found on Bug 1271622, as tc integration and mozharness testing were done in parallel.