Let pool.add() pass in all arguments to pool.addCallback, so tests that depend on the extra parameters don't just fail silently (eg: cl/129393147)
Let pool.add() pass in all arguments to pool.addCallback, so tests that depend on the extra parameters don't just fail silently (eg: cl/129393147)

RELNOTES: Cleanup of deferred queue's pool.add()

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MOE_MIGRATED_REVID=129870289

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