Previously, we had a single mac signing task that signed all mac locales and subpartners in a single signing task. This task required us to bump the signing task timeout. Chunking gives us a speed boost and a bit more resiliency if a single signing task fails - we don't have to re-sign everything, only the tasks that fail.
MozReview-Commit-ID: 4vPZE1vzZoQ
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extra : rebase_source : 320e9b51061b57d65d08aed1e621983e911c7b6d
extra : source : 00c8d34184b954d259c04459da916bda8baaca78